SpringMVC中通过@ResponseBody返回对象，Js中调用@ResponseBody返回值，统计剩余评论字数的js，@RequestParam默认值，@PathVariable的用法

1、SpringMVC中通过@ResponseBody、@RequestParam默认值，@PathVariable的用法

package com.kuman.cartoon.controller.friendsfuns;

import java.util.ArrayList;

import java.util.List;

import java.util.Map;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.util.CollectionUtils;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.bind.annotation.SessionAttributes;

import com.kuman.cartoon.common.Page;

import com.kuman.cartoon.common.controller.BaseController;

import com.kuman.cartoon.entity.Friend;

import com.kuman.cartoon.entity.User;

import com.kuman.cartoon.service.UserService;

/**

* "我的好友"和"我的粉丝"部分的代码

*

* 修改原来的好友和粉丝部分的代码

*

* @author to.to

*/

@Controller

@RequestMapping(value = "/friendsAndFuns", method = { RequestMethod.GET,

RequestMethod.POST })

@SessionAttributes(value = { "accountid", "account" })

public class FriendsAndFuns extends BaseController {

@SuppressWarnings("unused")

private static final Logger LOGGER = LoggerFactory

.getLogger(FriendsAndFuns.class);

@Autowired

UserService userService;

/**

* 跳转到"我的好友"和"我的关注页面"

*

* @param userId

*            用户登录用的Id

* @param friendId

*            登录用户的好友的Id

* @param pageNo

*            当前页码数

* @param pageRow

*            每页显示条数

* @return

*/

@RequestMapping(value = "/toFriendFuns/{userId}")

public String toFriendFuns(

Model model,

@PathVariable("userId") int userId,

@RequestParam(value = "pageNo", required = false, defaultValue = "1") int pageNo,

@RequestParam(value = "pageRow", required = false, defaultValue = "12") int pageRow,

@RequestParam(value = "friendId", required = false, defaultValue = "-1") int friendId) {

// 1、判断用户是否登陆过了，如果登录过了直接进入到后续过程

User user = isLogin(model);

if (null == user) {

return "redirect:/user/login";

} else {

// 如果有了直接调转到登陆页面

// LOGGER.info("friendId = " + friendId);

// LOGGER.info("pageNo = " + pageNo);

// LOGGER.info("pageRow = " + pageRow);

model.addAttribute("user", user);

model.addAttribute("friendId", friendId);

model.addAttribute("pageNo", pageNo);

model.addAttribute("pageRow", pageRow);

return "/web/friendsfuns/friendfuns";

}

}

/**

* 显示关注的用户

*

* @param map

* @param userId

* @param pageNo

* @param pageRow

* @return

*/

@SuppressWarnings({ "unchecked", "rawtypes" })

@RequestMapping(value = "/follow/{userId}", produces = { "text/html" })

public String showFollow(

Map<String, Object> map,

Model model,

@PathVariable("userId") int userId,

@RequestParam(value = "friendId", required = false, defaultValue = "-1") int friendId,

@RequestParam(value = "pageNo", required = false, defaultValue = "1") int pageNo,

@RequestParam(value = "pageRow", required = false, defaultValue = "12") int pageRow) {

// 1、判断用户是否登录了，如果登录了直接查询，如果没有要跳转到登录页面

User loginedUser = isLogin(model);

if (null == loginedUser) {

return "redirect:/user/login";

} else {

User user = userService.queryUser(userId, false);

Page page = userService.queryUserByFansId(pageNo, pageRow,

user.getUserId());

// 关注的好友

List<Object> fUserList = new ArrayList<Object>();

for (Object o : page.getRecordList()) {

Friend friend = (Friend) o;

// 关注的好友

User fUser = friend.getUser();

// 关注的好友所关注的好友

List<Friend> friendList = userService.queryUserByFansId(fUser

.getUserId());

if (!CollectionUtils.isEmpty(friendList)) {

fUser.setFollowCount(friendList.size());

}

fUserList.add(friend);

}

page.setRecordList(fUserList);

// 用户信息

map.put("user", user);

map.put("page", page);

return "/web/friendsfuns/follow";

}

}

/**

* 用于模拟跳转到"动态管理"页面中去

*

* @param model

* @return

*/

@RequestMapping(value = "/toUserDy/{userId}")

public String toUserDy(Model model, @PathVariable("userId") int userId) {

return "/web/friendsfuns/userdy";

}

/**

* 获取粉丝信息

*

* @param map

* @param userId

* @param pageNo

* @param pageRow

* @return

*/

@SuppressWarnings({ "rawtypes", "unchecked" })

@RequestMapping(value = "/funs/{userId}", produces = { "text/html" })

public String showFuns(

Map<String, Object> map,

Model model,

@PathVariable("userId") int userId,

@RequestParam(value = "friendId", required = false, defaultValue = "-1") int friendId,

@RequestParam(value = "pageNo", required = false, defaultValue = "1") int pageNo,

@RequestParam(value = "pageRow", required = false, defaultValue = "12") int pageRow) {

// 1、判断用户是否已经登录进去了，如果登录进去了，则可以查询自己的粉丝

User loginedUser = isLogin(model);

if (null == loginedUser) {

return "redirect:/user/login";

} else {

User user = userService.queryUser(userId, false);

Page page = userService.queryFansByUserId(pageNo, pageRow, userId);

// 粉丝

List<Object> fUserList = new ArrayList<Object>();

for (Object o : page.getRecordList()) {

Friend friend = (Friend) o;

// 粉丝

User fUser = friend.getFans();

// 粉丝所关注的好友

List<Friend> friendList = userService.queryUserByFansId(fUser

.getUserId());

if (!CollectionUtils.isEmpty(friendList)) {

fUser.setFollowCount(friendList.size());

}

fUserList.add(friend);

}

page.setRecordList(fUserList);

map.put("user", user);

map.put("page", page);

return "/web/friendsfuns/funs";

}

}

}