Java Web之Servlet及Cookie/Session

Servlet参考文献：

1、http://www.cnblogs.com/luoxn28/p/5460073.html

2、http://www.cnblogs.com/xdp-gacl/p/3760336.html

一、Servlet简介

　　Servlet是sun公司提供的一门用于开发动态web资源的技术。
　　Sun公司在其API中提供了一个servlet接口，用户若想用发一个动态web资源(即开发一个Java程序向浏览器输出数据)，需要完成以下2个步骤：
　　1、编写一个Java类，实现servlet接口。
　　2、把开发好的Java类部署到web服务器中。
　　按照一种约定俗成的称呼习惯，通常我们也把实现了servlet接口的java程序，称之为Servlet。

二、Servlet实现　

　　Servlet接口SUN公司定义了两个默认实现类，分别为：GenericServlet、HttpServlet。

　　HttpServlet指能够处理HTTP请求的servlet，它在原有Servlet接口上添加了一些与HTTP协议处理方法，它比Servlet接口的功能更为强大。因此开发人员在编写Servlet时，通常应继承这个类，而避免直接去实现Servlet接口。
　　HttpServlet在实现Servlet接口时，覆写了service方法，该方法体内的代码会自动判断用户的请求方式，如为GET请求，则调用HttpServlet的doGet方法，如为Post请求，则调用doPost方法。因此，开发人员在编写Servlet时，通常只需要覆写doGet或doPost方法，而不要去覆写service方法。

　　通常是通过继承HttpServlet来实现自己的Servlet。要访问所实现的Servlet，需要在web.xml里进行配置，典型配置如下：

    <servlet>
        <description>test of servlet life cycle</description>
        <display-name>ServletLifeCycle</display-name>
        <servlet-name>ServletLifeCycle</servlet-name>
        <servlet-class>com.zsm.servlet.ServletLifeCycle</servlet-class>
        <!--使用<init-param>元素配置Servlet辅助信息，当Tomcat初始化一个Servlet时，会将该配置信息封装成一个ServletConfig对象通过init(ServletConfig config)传递到Servlet，在其中可以访问到。可以不配做-->
        <init-param>
            <param-name>myServletInfo</param-name>
            <param-value>“hello there”</param-value>
        </init-param>
        <!--
        1)load-on-startup元素标记容器是否在启动的时候就加载这个servlet(实例化并调用其init()方法)。
        2)它的值必须是一个整数，表示servlet应该被载入的顺序
        2)当值为0或者大于0时，表示容器在应用启动时就加载并初始化这个servlet；
        3)当值小于0或者没有指定时，则表示容器在该servlet被选择时才会去加载。
        4)正数的值越小，该servlet的优先级越高，应用启动时就越先加载。
        5)当值相同时，容器就会自己选择顺序来加载。-->
        <load-on-startup>-10</load-on-startup>
    </servlet>
    <!--一个servlet-name可以有多个url-pattern；在Servlet映射到的URL中也可以使用*通配符，但是只能有两种固定的格式：一种格式是"*.扩展名"，另一种格式是以正斜杠（/）开头并以"/*"结尾。如：*.jsp、/*、/abc、/abc/*等-->
    <servlet-mapping>
        <servlet-name>ServletLifeCycle</servlet-name>
        <url-pattern>/ServletLifeCycle</url-pattern>
    </servlet-mapping>

三、Servlet的运行过程

Servlet程序是由WEB服务器调用，web服务器收到客户端的Servlet访问请求后：
　　①Web服务器首先检查是否已经装载并创建了该Servlet的实例对象。如果是，则直接执行第④步，否则，执行第②步。
　　②装载并创建该Servlet的一个实例对象。 
　　③调用Servlet实例对象的init()方法。
　　④创建一个用于封装HTTP请求消息的HttpServletRequest对象和一个代表HTTP响应消息的HttpServletResponse对象，然后调用Servlet的service()方法并将请求和响应对象作为参数传递进去。
　　⑤WEB应用程序被停止或重新启动之前，Servlet引擎将卸载Servlet，并在卸载之前调用Servlet的destroy()方法。 
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99vzhhjJ1QsbqInU/zaNtWF6J48/l89k3s06f3yVM09c2fz6f+BDVPoPRd9yXiPXmJpmnKsjQkvkMR5zw8zLnuo4gYJbsrlmVpXJG7XC5IHKueVK/cnRU+jMLtA+HvCYXRxuYoVhexJyDGQ+K7rsPjO+xp1IPoD10LiaeKgd4WuxIxNQQYhEEWDZHqzy34LxCFvB64bVvMi7jdbmOHt3gszqhN1hUx/OgJCEa1oyYz6DweD+Rt7EcvDW6ohp5PP6h+/eyyExFTwQYMiJ9Fg9N3VX1wPlnfa4MFvPEh4v0ag6w+IvbTtu3kaFyv17quJ+TNl2APIqZx+mBk+mBkAnlxEe+GzYuYreuH8XHCsARCEadhwyLmr+9AGCgbBiQQijgNWxUxG3UsjJgOoxEIRZwGijgjGDSBoQiEIk7DJkXMFp0MQwcYh0Ao4jRsTMRMd86HMewohWAo4jRsScRsyFgwkoxAIBRxGjYjYrZiXDKPZ+bVD4ciTgNFnC85hzTnuo+CIk7DNkTMJlyIbAPrexYL+Q1jnoZZsY3VSL595CqLBGQb22wrPpaIgWLMPVDEuZNnePOs9QQo4jS8uoh31ngpn5sVyM4iHEietZ4ARZwGijgpZVmez+cJr9f1G3ym33cW5BAyrPI0KOI0vLSId9lyeBC1/ymoeK2W/hhpvIsBn16vV+MdBCEvy/Gwyzj7ybDK06CI00ARL0XfA//xXqy+MSwGy3g38FNDae8Jx1sJjE8nv6YXbDrUE8itvpOhiNPwuiJ+zWaTF9X4D69tW7xq10nfO7VQ7P1+h1v1ApX2PhiI2Ph0QrrDKGHO5psjt/pOhiJOw85FrL+QEUBY198vcDXm8cGDwvl8lo/KskRuwX941+u1LMvnSPCO3uv1ml7EXWb9JKvKzoEiTsPORdz9vLRR/2kP2rYtyxJKdb5kDONTp+D8Im7b9nQ66bur69rOVBhpYrxkGykLinhpsqrsHCjiNLyoiOO22bX/Va9wtNNidV33vT7WL2K85VvMi6RwURRGXvjxeOC961iunwwgYj1rYYvY+HS+iLucuko+NZ0JRZyGLESMAp1vMve8wPx0OvXNbRhMTQhN05xOJ718ff5D9zPurqpK39ftdjudTno5UDauyOHts4/HQ1zvfwF7OPl0lXxqOhOKOA25iBi+s+cqYOxpWA/Li6LwHF7IEcLC+sSy2+2GU4KhXRQoYnWeAJDv1mdHIGEd8X3g+XSVfGo6E4o4Da8o4iUaDPkBe44X0gh2mvhyudR13TRNXddIX2AWhBwhDhIzfI1PQdM0RVHoqWHkjsuyRMn24RlZbHsFO5d9Op2QlLjf754hfCD5dJV8ajoTijgNuYi468lO4Ce/LcGyLKE2uO/5fOLKHkqAiKuqgmfbtsVwVVIEt9vNTheUZSmuPJ/PhjSR7cUg9/wb7FqWO9cBHpUHhmjO5hsin5rOhCJOQ0Yihit1/WHA27atnWpAvkIfQT8eD6wmU9+M8qHL+/3etq2dA8HIWvZuj5c9VFVlnEJsj8cik96SSTXnQxGnISMRIxWrZ2wvlwtUCIeKdu/3O6xtHxgGxU4RI3ugTzoWDAsDZJCrqvI/KcK2MMBY3rPhNDLpLZlUcz4UcRoyEjFGvvolOPkbDhXfYSrFIM4jt5c7LSzgJg47a9z9zHR2mh1UVVUUhXMS9GQy6S2ZVHM+FHEaMhJx9zPyhfIej4eexoVDMTgdvHcuXMSSr+gr6n6/Y0YHThJ1XV+v16ZpcBlQBul9HsdEN4zEMb+N9zqHkEk150MRpyEvESM7Af8ag1DY8HK5IHure9l5hIMivt/v8rgJ3Ljs5HQ6nU4nnBVEx0VRYN6bvpoM2I2P9PG7MR95Apn0lkyqOR+KOA15iRjZCcwaNhKvuBaHQWhd13CxPd0NT/NxihiF43HDeKwPltt3JOucz2f9+ZaQcmfdtXw+nyW7raz76JRSj8cjSo4ik96SSTXnQxGnIS8Rdz+5grqu7Qf4ynxhGZ/aN3pcr1d5kJDxERLN//vf/4y5EIMidl5zs0Wsz2K2RRzlFucum96SSTXnQxGnITsRy21s9k94ubmj67qmaSRRoD81AjOLnSIuisI5vWFDIs6nq+RT05lQxGnITsT23AkB8pVZCiJcHaQRMCguy1Ju6CjL0mnhjiJ+SfKp6Uwo4jS8ooi75bMTfS8WMu5URrYXCjbm7eqzHcqy9LwgY1DEzoNBsXLLnP7MCuMjnBWYIB5FPjWdCUWchhxFnBj7qZU6uFnZ3soeEctqzhFxlJs79hR2P/nUdCYUcRoo4sXBXIi+T/VZE8ZW+r+6ee2b8QJvlR5kT2H3k6ymM1+wvToUcRpeVMTdjprNP7H3dTrqbgIeQpTKhuTlL5dLURThGXw8f1XW92+IOe/OdfQJlHPYhIgxo3TUE6/kCTP+7ikX7e3VMP8q8O3pUk5fCpEiJv/IKuBRKovnmvp7MrJP4WXiAdly4Reb9/Ve+/Epwvl8tl8KM4HXF7H9OO9AMF3V82u1+7GtXbh4PPydDHLjVd/F+fAjd2w+Z+OBonPywuo4J+TtmFiV9T9IpPuZeK4v8T85GkMnva/iGkPfg5/6LK9fVJjDi4s4cGDrBFe57QDKTQbynEW7cNjfL3EDeSXxxkTc0cUJyS3UseqLGzKla2EWoz6hBXer20+O9oyk7L6K+Tn20/s8P3V3IOKmafQq403nxjp47pUtysfjgSSP5zo5tIgcDpA7CZT2tFtnhOW+MPujy+XSl6+oqsrZKGjKt7c3f0A8UMR7IMM4x6oyRmSeTK49Ih7EOWhCAvR+v4sXkH3uK8Qp4gmTzVcUsXKhuzIBTqXKMNzIV+BZXXN2d/g4TIzttM1G7CA/R6QnwyAvV+WmaZ4adV2XZSn/Ysj89KKUquvaXm7cFIonSdl77NuR/sSrcCIGalRRxv2r8o5defZA3zhXVChPJZxwqLK7tm3v97tRviSOnUNppT0srGma+/3uT5vIGyc+D4e/x+8JR9tRxDsgzwgvKmL91y6yE0ZPfjweeGBpn4jx6Kg+0L0lQdk0DW68BPpj/HAXksGodOpaIkYtZCKEjEChV891ORgcq6lJNzrhjIVfG7hpdtSoVtQvMyX0/L5x+xUeIoYUytjj1EnRh/M0RTLyDG/EWj+9v/enpSYGJ1qg6zpLFo/4M9HhBzOzhGlFwaQQFtyKp76ooUtkGMx6Hil+vV6d98HiuqueW7BXk2LVT3IZyyVZ4XxAgnHaELNfLpfb7YY6UsRZk21sZ1b8drthdCmPse5b0yli5A0ul4tzvAaP2H7XHz6F0a5z5qz+Ylk9pzyNVUQsv9bxrwQZw+S6ru/3O7I3WAHWw1kHG8LjeL2v8SMAI1Bjj8+fKQ06xuQ/48U9eIeD8/hlzb4nH+hFyWNvA4PjJFE3ztYXS5NtYGdWHGnZ7qcDo5/Xde18tXYf9/sdL/Y2Rkzo5MZgFr9z8SMX8wTOrsdF4Xiez6dcrJs5d2IVETvzEnjHI8wlj3nRwSNf1O+8BNLl+plSStP3eP55tq1gnFyNR4BhVOu8HIoVBu8u0auAAXVgcJyk68bZKmM5cg5prLqj480pQaZYyRL8q4/a4CC5QoVxllPEun/xR1VV/uSJn1VEPJiX0MeSkortXHkJNJCezbA9K5KVvSjrde+yFf54Pp/2Y2+x97IsA++jkRPGqOA4oYi3SubxXFTE6M/O62x4LaFdgj62gojxNqzux8IQR9M0srktYn14LiLGkHByBdOL2JgvgbGqkZfQ3aoPn/VBKwIl2Vs5G8mQVj8w2aN+pQ7odydDxPhUP0gsH3wju4DGbZpG0lObEXGXvTsiwkguLWLn/DM40f7RaigVIsb907fbTX8PoZ5ztEVcFIUM9PR5xPpbaMeSXsQYVxoatfMSckKS4bORPTDMe9Ue5207VP61f6Dow3N8iiCLneUtZcjdq2D0lNSWRNzldyfuEjCG3cIidiYNBj8C+q16/rvjjKIwv1X/1LiCP+2tsulFrEtKxqd9eQn9sp4IWmlDWns+A/5FUZLSxUcy+JWBLcQKzxoPAMJQXW8gTDrW9SqHN/gcjI2J+N9es/fIZBg6sLSI9akLOnIXhrMoXOUXEaPwvj6sixjTUXXVGhLHrie4OLGIjbSDPOHMn5dATfXBpswVEdVKogb/YlSL0a6EBaNjOZ/pFpZPRfEylPZItu/Vl9OC49t8zsazdkyhjIdBExYSsYxkR42IMclBfmsr7adxVVV9AtWLKsvSmKZmiBijudPpNPbCXWIRO6dDyH0cuFnGXgGzceVfPcMrY1IkZ9BeWAEm1ZM2+rvbcQ7Qw6XnJbrf8yj6znA47JDZ3BRxLjBiOkuIWGa2hosYCjZmDSsrR+l0sRSFcaL9qYi4LEtMeoU1Rt3lkVLExjMckJc4n8+QKZ7qqa8gkm3bVhe0HkzU2p44jG31fL1kHh6PB2ZE6Ffe9LyE7FfHvkznnIAxOTgDm8/ZeCao5IoHsBUYKJvoIq6qSsZWkKDrKQhXeSkiFKxcN4MYIhYFGBfcsAu5ZQNXivQciPHUN1z0f+URsZjXWI4f+JfLBRJ0zkwQIdrXQp3r22/7lVTD+Xy+3W64WGoLVwcB77tlxshW+9mwiP8dARXjhfFxElfExlyIwRExfuT2vVxDWU9fk1/B8uJwKapvvpT/Ql84KUXs2dA/rpTHIQXuwvnwTMk8OEMKKQe+j2PCJpsXcUfX9MPI9BErMhhGGVdjBkV8Op08c3ttEXdd93w+ZYCGYbV/AsZuRCw3dHjWkac3hCQBbrcb0h34F7kLyWw4LTwqyTBtkz2IuLPmBhJGw0+s4KC/GdfNB0Vsd07MMu5+vOPcvG1b5BwGM9HdjkTsfJpH27bGkx8QtOfz6cwICXLixL9GCX1nx1FJhsFNmqZB1l5fuBMRC7RPxyAEEDFEdnoBD5/UV7hcLjCj6nkQzOPxOGuPOwgZRmUiYk9AjKcAd12Hx3fojyENBL82+m57sZMMzjPBWPTd7U3EXfYayrz6gSwaJeeQFrkF/93GMls2ZC+4puT5dP4zMLu1RTz4MHuMaj0npBD02Rf2p5KgN04GuOlxrPGF2+2mF7hDEXe5/jDPs9bTWDRQfZfRB2cstG0bnoWc/4bmEFYfEftp23Z+HIyX4y2xi0H2KWKQiZj0n2YkEIYrkBcX8W7Ys4jBviW146otCuMWCEWchv2LGOxPx/urUUoYukAo4jTkImKwA3kxEREFBjAQijgNeYkY2PNI1j6iIDZ0qK8PIxkIRZyGHEVs84JG3ujZYiswnoFQxGmgiH+xuvVWP4BMYIQDoYjTQBG7STMg5bB3LRjqQCjiNFDEodjSDLTn5A3JcjD4gVDEaaCII+BRLb98rwnbJRCKOA0UMckRSiEQijgNFDHJEUohEIo4DRQxyRFKIRCKOA0UMckRSiEQijgNFDHJEUohEIo4DRQxyRFKIRCKOA0UMckRSiEQijgNFDHJEUohEIo4DRQxyRFKIRCKOA0UMckRSiEQijgNFDHJEUohEIo4DRQxyRFKIRCKOA0UMckRSiEQijgNFDHJEUohEIo4DRQxyRFKIRCKOA0UMckRSiEQijgNFDHJEUohEIo4DRQxyRFKIRCKOA0UMckRSiEQijgNFDHJEf9rBolOxJjHKmp/zAwOI0sICWLtE8qrMyu2sRqJEELINChiQghZGYqYEEJWhiImhJCVoYgJIWRlKGJCCFkZipgQQlaGIiaEkJWhiAkhZGUoYkIIWRmKmBBCVoYiJoSQlaGICSFkZShiQghZGYqYEEJWhiImhJCVoYgJIWRlKGJCCFkZipgQQlaGIiaEkJWhiAl5df4ev2e+m5K8OGxdQl6d4+cXRbxv2LqEvDqHjwNFvG/YuoS8NBgOb1fEf4/fx88vOZccP7/e//xRSn0dPruu+z4ePw+Ht7c3pdT7nz9fn59d130dPt/e3t7e3r4+P7+PR6WUXcjH+7tSCuvo+5LS3sHqLigAAAQOSURBVN7ePg+Hv8dvY9vvryP+lmNw7lHKdB5hdLbauoTEwmMKfyf8+vzEmujAYkzDm/bCvmJtHRw+PtRvDh8fqQITh/c/fxAlCen31/H9z5+P9/fj59fb29vx86vruu+vI9z68f4uAZGQfry/64Vgk7/Hb7Ta4ePQdd338ah7+fvriGD+2vbzU1b4PBz+LTl82nuUf51HGD1KFDHJnT5TvP/509cJv4/H9z9/Dh8ff4/f+qdKKQjUGMB+f/23sNc+/TrY9IgYoAqoNfh7/JY4AImSfsL7Onwacfg+HvWS0XY4fRpnSrTF29sbrnYa22IhWlnfSvYYeIRR2HbrEhILwxT+Tvjx/m4Mi3T/Or2JhZ5ijU1sAcWr6wrYVcCA1Lna+58/skSfMeKMA05a+HlhOFr2gmD27U4p9Xk42Hv0HGH0QfG2W5eQWBgd1a8JY3BnlODp855i+3TQV+C2sKsgv0KcGMnfvkK6n0D1hQjnOdmXs0DkN+w9+o9wYiB62HbrEhILo3f5O6FSCkkJZwmePj9YbLiAtoVdBU+l5GIaLrgNbuKXo8eestC5x5Rh33brEhILo9cNdmzPck+f9/ftsQLaEH0its9n4PvriF8PiAZyDsuJ2LlH/xHGZdutS0gsnCJ2dsL5Ivb07VEC2hB2FfoyPH+P35Ij/j7+u5iJuSKDIv7+MnPE+FQmnwwelb7HkCOMxbZbl5BYGH3S0wn7ZBoi4sC+HSigDWFXAecbY8ZC9+NN+VcC7iyk+8kC42Kd/jPi36fHIwLuPzvqrSl77DvCr8/P6JMIt926hMTC6Kj+TuiUaYiIPcX26aCvwG3hHHvKyUlGsjCmMd6UJc5h7+HjA/H8N3Hi96eY6+08gE4TsdzZoe+x7wiNeS9R2HbrEhILo6P6O6EtC70EDGZ1q8ocNU+xfTqwj21zyIDUsKRxC4yOhAKnLojPDh3ui0ECR+7gEEsisN/Ho/MA9OkWfXt0HqE97p7PhluXkFg4O6qnE6Kvfry/QwG4N090ieGtdFf9pjv95hGjWI8OYPbvr+P313Fzd9bZldU/1W84xj11Sqnv41HuWvx4f5dG+ddGx/9unzl8HPS5w9/H4+Hjv1sWcYtz3wEYC517dB7hIlFaolBCNoTHFJ5O+PX5iQ6PW3W73+NW3KysmwJ/Hz+//h6/ncV6BIQb+dQyY7ENYXt8N+yzVoSkZ8eaeBF2HOF91oqQ9OxYEy/CjiO8z1oRkp4da+JF2HGE91krQtKzY028Av/NPHHdtbF1+L0hJAL71sTqeC6o7oO91YeQ9OxeE2Rp+I0hhJCVoYgJIWRlKGJCCFkZipgQQlaGIiaEkJWhiAkhZGUoYkIIWRmKmBBCVoYiJoSQlaGICSFkZf4PolyK7ST9SwUAAAAASUVORK5CYII=" 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" 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" 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" 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四、Servlet调用图

　

五、关于HttpServletResponse

参考文献：http://www.cnblogs.com/xdp-gacl/p/3789624.html

• getOutputStream和getWriter方法分别用于得到输出二进制数据、输出文本数据的ServletOuputStream、Printwriter对象。
• getOutputStream和getWriter这两个方法互相排斥，调用了其中的任何一个方法后，就不能再调用另一方法。
• Servlet程序向ServletOutputStream或PrintWriter对象中写入的数据将被Servlet引擎从response里面获取，Servlet引擎将这些数据当作响应消息的正文，然后再与响应状态行和各响应头组合后输出到客户端。
• Serlvet的service方法结束后，Servlet引擎将检查getWriter或getOutputStream方法返回的输出流对象是否已经调用过close方法，如果没有，Servlet引擎将调用close方法关闭该输出流对象。

六、关于HttpServletRequest

参考文献：Request http://www.cnblogs.com/xdp-gacl/p/3798347.html

使用Request对象实现请求转发：

　　请求转发：指一个web资源收到客户端请求后，通知服务器去调用另外一个web资源进行处理。

请求重定向和请求转发的区别：

• 一个web资源收到客户端请求后，通知服务器去调用另外一个web资源进行处理，称之为请求转发/307。请求转发只能转发到同一web应用内的其他url去。
• 一个web资源收到客户端请求后，通知浏览器去访问另外一个web资源进行处理，称之为请求重定向/302。请求重定向可以转发到任何url去，不限制在同一web应用内。

请求转发的应用场景：MVC设计模式

在Servlet中实现请求转发的两种方式：

1. 通过ServletContext的getRequestDispatcher(String path)方法，该方法返回一个RequestDispatcher对象，调用这个对象的forward方法可以实现请求转发。 例如：将请求转发到test.jsp页面

   RequestDispatcher reqDispatcher =this.getServletContext().getRequestDispatcher("/test.jsp");
   reqDispatcher.forward(request, response);

2. 通过request对象提供的getRequestDispatche(String path)方法，该方法返回一个RequestDispatcher对象，调用这个对象的forward方法可以实现请求转发。 例如：将请求转发的test.jsp页面

   request.getRequestDispatcher("/test.jsp").forward(request, response);

   request对象同时也是一个域对象(Map容器)，开发人员通过request对象在实现转发时，把数据通过request对象带给其它web资源处理。

七、会话管理

1、会话的概念

　　会话可简单理解为：用户开一个浏览器，点击多个超链接，访问服务器多个web资源，然后关闭浏览器，整个过程称之为一个会话。
　　有状态会话：一个同学来过教室，下次再来教室，我们会知道这个同学曾经来过，这称之为有状态会话。

2、会话过程中要解决的问题

　　每个用户在使用浏览器与服务器进行会话的过程中，不可避免各自会产生一些数据，程序要想办法为每个用户保存这些数据。

3、保存会话数据的两种技术

3.1、Cookie

　　Cookie是客户端技术，程序把每个用户的数据以cookie的形式写给用户各自的浏览器。当用户使用浏览器再去访问服务器中的web资源时，就会带着各自的数据去。这样，web资源处理的就是用户各自的数据了。

3.2、Session

　　Session是服务器端技术，利用这个技术，服务器在运行时可以为每一个用户的浏览器创建一个其独享的session对象，由于session为用户浏览器独享，所以用户在访问服务器的web资源时，服务器可以把与该用户相关的数据关联到其对应的session中，当用户再去访问服务器中的其它web资源时，其它web资源再从用户各自的session中取出数据为用户服务。

八、使用Cookie进行会话管理

参考文献：http://www.cnblogs.com/xdp-gacl/p/3803033.html

Cookie有效期：

cookie.setMaxAge(0);//不记录cookie

cookie.setMaxAge(-1);//会话级cookie，关闭浏览器失效

cookie.setMaxAge(60*60);//过期时间为1小时

1、Cookie的设置

 //用户访问过之后重新设置用户的访问时间，存储到cookie中，然后发送到客户端浏览器
        Cookie cookie = new Cookie("lastAccessTime", System.currentTimeMillis()+"");//创建一个cookie，cookie的名字是lastAccessTime
//将cookie对象添加到response对象中，这样服务器在输出response对象中的内容时就会把cookie也输出到客户端浏览器
        response.addCookie(cookie);

2、Cookie的删除

//创建一个名字为lastAccessTime的cookie
        Cookie cookie = new Cookie("lastAccessTime", System.currentTimeMillis()+"");
//将cookie的有效期设置为0，命令浏览器删除该cookie
        cookie.setMaxAge(0);
        response.addCookie(cookie);

3、Cookie中存取中文

Cookie cookie = new Cookie("user", URLEncoder.encode("小张"));// 包含中文时必须编码否则会出错
response.addCookie(cookie);

一些细节：

• 一个Cookie只能标识一种信息，它至少含有一个标识该信息的名称（NAME）和设置值（VALUE）。
• 一个WEB站点可以给一个WEB浏览器发送多个Cookie，一个WEB浏览器也可以存储多个WEB站点提供的Cookie。
• 浏览器一般只允许存放300个Cookie，每个站点最多存放20个Cookie，每个Cookie的大小限制为4KB。
• 如果创建了一个cookie，并将他发送到浏览器，默认情况下它是一个会话级别的cookie（即存储在浏览器的内存中），用户退出浏览器之后即被删除。若希望浏览器将该cookie存储在磁盘上，则需要使用maxAge，并给出一个以秒为单位的时间。将最大时效设为0则是命令浏览器删除该cookie。

一个坑：

Cookie有有版本0和版本1，前者早出现，几乎被所有浏览器支持，但不能含空格，方括号，圆括号，等于号（=），逗号，双引号，斜杠，问号，@符号，冒号，分号等特殊字符，否则浏览器收到时会将值加上双引号，导致服务端收到的与写入的不一致；后支持了特殊字符，但浏览器兼容性比前者差。

为了兼容性，jdk里支持的是版本0，因此要解决双引号问题：写时url encode读时decode。可参阅：https://maoxian.de/2018/02/1480.html

java.servlet.http.Cookie 3.1.0已经0和1版本都支持

九、使用Session进行会话管理

参考文献：http://www.cnblogs.com/xdp-gacl/p/3855702.html

1、Session简单介绍

　　在WEB开发中，服务器可以为每个用户浏览器创建一个会话对象（session对象），注意：一个浏览器独占一个session对象(默认情况下)。因此，在需要保存用户数据时，服务器程序可以把用户数据写到用户浏览器独占的session中，当用户使用浏览器访问其它程序时，其它程序可以从用户的session中取出该用户的数据，为用户服务。

2、Session和Cookie的主要区别

• Cookie是把用户的数据写给用户的浏览器。
• Session技术把用户的数据写到用户独占的session中。
• Session对象由服务器创建，开发人员可以调用request对象的getSession方法得到session对象。

3、Session实现原理

（Session技术由服务器如Tomcat实现）

服务器创建session对象后，在服务器内存存储该对象，并把session的id号以cookie的形式回写给客户机（键为JSESSIONID，值为该session的id）。这样，只要客户机的浏览器不关，再去访问服务器时，都会带着session的id号去，服务器发现客户机浏览器带session id过来了，即可在内存中找到对应的session。

即Session会话（如何识别同一浏览器的多次请求属于同一个会话）是通过Cookie实现的。因此如果浏览器禁用Cookie的会会使Session没法work。

• 服务端如何保存不同会话的Session信息： protected Map<String, Session> sessions = new ConcurrentHashMap<>(); ，key为session的id、值为session对象
• 服务端如何保存与某个Session绑定的信息： protected Map<String, Object> attributes = new ConcurrentHashMap<String, Object>(); ，key为各属性名、值为属性值，保存的内容如session有效期及用户存入的其他attribute等

Session的具体实现原理课参阅：https://www.cnblogs.com/chenpi/p/5434537.html

透过现象看本质，可以发现Session技术根本上是依赖于浏览器会在每次请求时自动把某些数据放请求头上传给服务端（即Cookie技术）这一基础的。

Session技术的缺点：

• 内存占用：服务端在内存维护Session数据及关联的Attributes等信息，用户多时占用内存大
• 多节点共享：服务端一个应用常会部署多个实例，此场景下Session无法共享，导致在A实例上登录后在B实例不认为已登录这种情况
• 安全问题：在浏览器上登录某站点后得到的sessionID复制到B浏览器该站点对应的Cookie下，则B会被服务端认为是A，这就是Session劫持问题

4、Session对象的创建和销毁时机

• 创建：第一次调用request.getSession()方法时就会创建一个新的Session，可以用isNew()方法来判断Session是不是新创建的

• 销毁：session对象默认30分钟没有使用（指的是没有去读或写session，在业务上体现为有没有该session对应的request请求），则服务器会自动销毁session，在web.xml文件中可以手工配置session的失效时间（如下）；当需要在程序中手动设置Session失效时，可以手工调用session.invalidate方法，摧毁session。

      <session-config>
          <session-timeout>15</session-timeout>
      </session-config>

注意，session.setMaxInactiveInterval(int interval) 是用来设置最大不操作时间的，超过该时间不读写session则会被服务端删除该session，默认值是30分钟。

5、浏览器禁用Cookie时如何还能让Servlet共享Session中的数据

浏览器禁用Cookie后，服务端创建的Session的id就无法保存到客户端也就无法识别那个用户是哪个了，解决方法：对URL进行重写，当禁用时会自动Encodes the specified URL by including the session ID in it

　　response.encodeRedirectURL(java.lang.String url) 用于对sendRedirect方法后的url地址进行重写。
　　response.encodeURL(java.lang.String url)用于对表单action和超链接的url地址进行重写

示例：

        out.println("<hr>");
        request.getSession();// 获取或创建Session，必须要有此句后面的encodeURL才会在必要时把sessionid编入
        String pageContent = "<form action='" + response.encodeURL("VerificationCode") + "' method='post'> "
                + "验证码：<input type='text' name='validateCode'> " + "<img alt='验证码看不清，换一张' src='"
                + response.encodeURL("VerificationCode?createTypeFlag=nl") + "' > <br> "
                + "<input type='submit' value='提交'></form>";
        out.println(pageContent);

6、防止表单重复提交

6.1、重复提交的场景：

1. 用户点提交后在处理完之前又点提交
2. 点提交后刷新页面导致重复提交
3. 提交后点后退导致重复提交

6.2、解决方法

• 对于场景1，可以再客户端用js防止重复提交

          var isCommitted = false;//表单是否已经提交标识，默认为false
          function dosubmit(){
              if(isCommitted==false){
                  isCommitted = true;//提交表单后，将表单是否已经提交标识设置为true
                  return true;//返回true让表单正常提交
              }else{
                  return false;//返回false那么表单将不提交
              }
          }

• 对于场景2或3，单靠客户端无法解决，对于单节点服务器可以借助Session来解决：生成唯一的标识（Token）放在表单的隐藏域，同时把标识存入当前session域；收到请求时判断表单隐藏域Token是否与当前session中的一致则处理，并删掉session域中的Token。

  具体的做法：在服务器端生成一个唯一的随机标识号，专业术语称为Token(令牌)，同时在当前用户的Session域中保存这个Token。然后将Token发送到客户端的Form表单中，在Form表单中使用隐藏域来存储这个Token，表单提交的时候连同这个Token一起提交到服务器端，然后在服务器端判断客户端提交上来的Token与服务器端生成的Token是否一致，如果不一致，那就是重复提交了，此时服务器端就可以不处理重复提交的表单。如果相同则处理表单提交，处理完后清除当前用户的Session域中存储的标识号。
  　　在下列情况下，服务器程序将拒绝处理用户提交的表单请求：

  1. 存储Session域中的Token(令牌)与表单提交的Token(令牌)不同。
  2. 当前用户的Session中不存在Token(令牌)。
  3. 用户提交的表单数据中没有Token(令牌)。

十、其他

1、Servlet与普通Java类的区别

　　Servlet是一个供其他Java程序（Servlet引擎）调用的Java类，它不能独立运行，它的运行完全由Servlet引擎来控制和调度。

　　针对客户端的多次Servlet请求，通常情况下，服务器只会创建一个Servlet实例对象，也就是说Servlet实例对象一旦创建，它就会驻留在内存中，为后续的其它请求服务，直至web容器退出，servlet实例对象才会销毁。

　　在Servlet的整个生命周期内，Servlet的init方法只被调用一次。而对一个Servlet的每次访问请求都导致Servlet引擎调用一次servlet的service方法。对于每次访问请求，Servlet引擎都会创建一个新的HttpServletRequest请求对象和一个新的HttpServletResponse响应对象，然后将这两个对象作为参数传递给它调用的Servlet的service()方法，service方法再根据请求方式分别调用doXXX方法。

　　如果在<servlet>元素中配置了一个<load-on-startup>元素，那么WEB应用程序在启动时，就会装载并创建Servlet的实例对象、以及调用Servlet实例对象的init()方法。用途：为web应用写一个InitServlet，这个servlet配置为启动时装载，为整个web应用创建必要的数据库表和数据。

2、缺省Servlet

　　如果某个Servlet的映射路径仅仅为一个正斜杠（/），那么这个Servlet就成为当前Web应用程序的缺省Servlet。

　　凡是在web.xml文件中找不到匹配的<servlet-mapping>元素的URL，它们的访问请求都将交给缺省Servlet处理，也就是说，缺省Servlet用于处理所有其他Servlet都不处理的访问请求。

　　在<tomcat的安装目录>\conf\web.xml文件中，注册了一个名称为org.apache.catalina.servlets.DefaultServlet的Servlet，并将这个Servlet设置为了缺省Servlet。如下：

<servlet>
        <servlet-name>default</servlet-name>
        <servlet-class>org.apache.catalina.servlets.DefaultServlet</servlet-class>
        <init-param>
            <param-name>debug</param-name>
            <param-value>0</param-value>
        </init-param>
        <init-param>
            <param-name>listings</param-name>
            <param-value>false</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

 <!-- The mapping for the default servlet -->
    <servlet-mapping>
        <servlet-name>default</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

3、线程安全问题

　　当多个客户端并发访问同一个Servlet时，web服务器会为每一个客户端的访问请求创建一个线程，并在这个线程上调用Servlet的service方法，service方法会调用doGet或doPost等方法。因此在后者内如果访问了同一个文件资源或全局变量等就有可能引发线程安全问题，访问方法内定义的局部变量则不会有线程安全问题。