HttpClient_002_中文乱码、HttpClient中文乱码透析、总结

中文乱码原理代码：

 String s = "中文";
        byte[] bs2 = s.getBytes("utf-8");//将s拆成：utf-8个体，注：utf-8指s原本就是utf-8
        String s1 = new String(bs2,"iso-8859-1");//将bs2组装成：iso-8859-1串
        String s2 = new String(bs2,"utf-8");//将bs2组装成：utf-8串
        String s3 = new String(s1.getBytes("iso-8859-1"),"utf-8");//将s1拆成iso-8859-1串，然后组装成utf-8
        System.out.println(s1+"\n"+s2+"\n"+s3);

结果：

??????
中文
中文

实例源码下载：http://download.csdn.net/detail/poiuy1991719/8594485

解决HttpClient中文乱码，项目演示：

1：编写httpClient_001

所需包：

1、1：编写URLUtil类

package com.west.test.httpclient;

public class URLUtil {
    public static final String HttpClient_002="http://localhost:8080/httpClient_002/";//访问本地项目2路径
    public static final String POST_CONTENT=HttpClient_002+"PostContent";
}

1、2：编写Servlet类

package com.west.test.httpclient;

import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.PostMethod;
import javax.servlet.ServletException;

public class PostServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        System.out.println("========httpClient_001 PostServlet start=========");
        System.out.println("httpClient_001:doPost方式提交");
        HttpClient httpClient = new HttpClient();
        PostMethod method = new PostMethod(URLUtil.POST_CONTENT);
//         解决中文乱码(设置："我方"HttpClient提交、解析所用码)
        method.getParams().setContentCharset("utf-8");

        String charset=method.getParams().getContentCharset();
        NameValuePair name = new NameValuePair("name", "张三");
        NameValuePair password = new NameValuePair("password",
                "password:123321");
        method.setRequestBody(new NameValuePair[] { name, password });
        String rt = "";
        try {
            int status = httpClient.executeMethod(method);
            if (status == HttpStatus.SC_OK) {
                rt = method.getResponseBodyAsString();
                System.out.println("httpClient_001得到：" + rt);
                codeTest(rt,charset);
            }
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("网络连接失败，请联系管理员！");
        }
        // 释放HttpClient资源
        method.releaseConnection();
        outMessage(response, rt);

    }

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        System.out.println("httpClient_001:doGet方式提交");
        doPost(request, response);

    }

    public void outMessage(HttpServletResponse response, String message) {
        try {
//             解决"界面"中文乱码(设置："我方"提交所用码、"对方"解析所用码)
            response.setContentType("text/html;charset=utf-8");
            PrintWriter out = response.getWriter();
            out.print(message);
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void codeTest(String rt ,String charset) throws Exception {

        System.out.println("得到的是："+charset);
        byte[] btr=rt.getBytes(charset);
        String rt01 = new String(btr, "iso-8859-1");
        System.out.println("String(btr,'iso-8859-1')转码01：" + rt01);
        String rt02 = new String(btr, "utf-8");
        System.out.println("String(btr,'utf-8')转码02：" + rt02);
        String rt03 = new String(rt01.getBytes("iso-8859-1"), "utf-8");
        System.out.println(rt03);

    }
}

1.3：配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <display-name>test</display-name>

  <servlet>
    <servlet-name>PostServlet</servlet-name>
    <servlet-class>com.west.test.httpclient.PostServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>PostServlet</servlet-name>
    <url-pattern>/PostServlet</url-pattern>
  </servlet-mapping>

 <session-config>
  <session-timeout></session-timeout>
 </session-config>
 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
 </welcome-file-list>
</web-app>

1、3：编写界面：index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>test</title>
</head>
<body>
    <form action="PostServlet" method="post">
        <input type="submit" value="Post提交">
    </form>
</body>
</html>

2：编写项目：httpClient_002

2、1：编写Servlet类

package com.test.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class PostContent extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        System.out.println("=========httpClient_002 PostContent start============");
        System.out.println("httpClient_002:doPost方式执行");
//        解决中文乱码(设置:"我方"解析所用码)
        request.setCharacterEncoding("utf-8");

        String name = request.getParameter("name");
        String password = request.getParameter("password");
        System.out.println("httpClient_002得到:{name：" + name+",password:"+password+"}");
        String reStr = "{name=" + name + ",password="
                + password+"}";
        outMessage(response, reStr);
    }

    public void outMessage(HttpServletResponse response, Object message) {
        try {
//            解决中文乱码(设置："我方"提交所用码，"httpClient_001"解析所用码)
            response.setContentType("text/html;charset=utf-8");

            PrintWriter out = response.getWriter();
            out.print(message);
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2.2：配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <display-name>test002</display-name>

  <servlet>
    <servlet-name>PostContent</servlet-name>
    <servlet-class>com.test.servlet.PostContent</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>PostContent</servlet-name>
    <url-pattern>/PostContent</url-pattern>
  </servlet-mapping>

 <welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
  <welcome-file>default.html</welcome-file>
 </welcome-file-list>
</web-app>

3：总结

1、解决中文乱码(设置："我方"HttpClient提交、解析所用码)
   method.getParams().setContentCharset("utf-8");

2、解决"界面"中文乱码(设置："我方"提交所用码、"对方"解析所用码)
   response.setContentType("text/html;charset=utf-8");

3、解决中文乱码(设置:"我方"解析所用码)
   request.setCharacterEncoding("utf-8");

4、解决中文乱码(设置："我方"提交所用码、"httpClient_001"解析所用码)，同2
   response.setContentType("text/html;charset=utf-8");

附加：

请求网页、servlet：

GetMethod getMethod = new GetMethod("http://www.baidu.com");
//（1）、这里可以设置自己想要的编码格式
getMethod.getParams().setContentCharset("utf-8"); 

//（2）、对于get方法也可以这样设置
getMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"GB2312");  

//（3）、还可以如下这样设置
getMethod.addRequestHeader("Content-Type", "text/html; charset=UTF-8");  

//（4）、当然同样可以直接设置 httpClient 对象的编码格式
HttpClient httpClient = new HttpClient();
httpClient.getParams().setContentCharset("utf-8");

//使用流的方式读取也可以如下设置
InputStream in = getMethod.getResponseBodyAsStream();
//这里的编码规则要与上面的相对应
BufferedReader br = new BufferedReader(new InputStreamReader(in,"utf-8"));

请求方法、servlet：

PostMethod PostMethod= new PostMethod("http://localhost:8080/ezid-cert-mobile/upload");
//（1）、通常可以如下设置自己想要的编码格式
postMethod.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET,"utf-8");

//（2）、也重载PostMethod的getRequestCharSet()方法
public  class UTF8PostMethod extends PostMethod{
    public UTF8PostMethod(String url){
        super(url);
    }
    @Override
    public String getRequestCharSet() {
     return "UTF-8";
    }
}

//（3）、如果是方法的参数出现乱码问题，那么你可以如下设置参数
Charset utf8Charset = Charset.forName("UTF-8");
multipartContent.addPart("name", new StringBody(Info.getUserEntity().getName(), utf8Charset));

//（4）、如果你用的是Part [] parts={...}传参方式的话可以如下设置
StringPart name=new StringPart("name",certFormEntity.getPersonName(), "UTF-8");