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返回对象，作为JQuery中的ajax返回值

package com.kuman.cartoon.controller; import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.apache.commons.io.filefilter.FalseFileFilter; 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.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; 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.Comment; import com.kuman.cartoon.entity.CommentType; import com.kuman.cartoon.entity.User; import com.kuman.cartoon.service.CommentService; import com.kuman.cartoon.service.UserService; /** * @Title: 评论处理控制器 * @author huh 修改者：涂作权 */ @Controller @SessionAttributes(value = { "accountid", "account" }) public class CommentController extends BaseController { private static final Logger LOGGER = LoggerFactory .getLogger(CommentController.class); /** * 发布评论，下面的方法返回一个boolean值，可以直接在ajax回调中中使用 * * @param request * @param comment * @return */ @ResponseBody @RequestMapping(value = "/comment/add", method = RequestMethod.POST) public boolean sendComment(HttpServletRequest request, Comment comment) { if (comment == null) { return Boolean.FALSE; } comment.setCommentType(CommentType.CONTENT); // 保存浏览用户，从session中取 int userId = -1; Object objUserId = request.getSession().getAttribute("accountid"); if (objUserId != null) { try { userId = Integer.parseInt(objUserId.toString()); } catch (Exception e) { } } else { return Boolean.FALSE; } comment.setUser(userService.queryUser(userId)); try { commentService.saveComment(comment); } catch (Exception e) { LOGGER.error("发布评论出错", e); return Boolean.FALSE; } return Boolean.TRUE; } /** * 赞同评论 * * @param comment * @return */ @ResponseBody @RequestMapping(value = "/comment/commentlike", method = RequestMethod.POST) public boolean commentLike(String cid) { Comment comment = null; try { comment = commentService.queryCommentById(Integer.parseInt(cid)); if (comment == null) { LOGGER.error("点赞出错未查找到评论" + cid); return Boolean.FALSE; } } catch (Exception e) { LOGGER.error("点赞出错", e); } try { comment.setLikecount(comment.getLikecount() + 1); commentService.updateComment(comment); } catch (Exception e) { LOGGER.error("点赞出错", e); return Boolean.FALSE; } return Boolean.TRUE; } /** * 删除评论 * * @param comment * @return */ @Deprecated @ResponseBody @RequestMapping(value = "/comment/del", method = RequestMethod.POST) public boolean commentDel(String cid) { Comment comment = null; try { comment = commentService.queryCommentById(Integer.parseInt(cid)); if (comment == null) { LOGGER.error("删除出错未查找到评论" + cid); return Boolean.FALSE; } } catch (Exception e) { LOGGER.error("删除出错", e); } try { commentService.delComment(Integer.parseInt(cid)); } catch (Exception e) { LOGGER.error("删除出错", e); return Boolean.FALSE; } return Boolean.TRUE; } /** * 反对评论 * * @param comment * @return */ @Deprecated @ResponseBody @RequestMapping(value = "/comment/commentoppose", method = RequestMethod.POST) public boolean commentOppose(String cid) { Comment comment = null; try { comment = commentService.queryCommentById(Integer.parseInt(cid)); } catch (Exception e) { LOGGER.error("反对出错", e); return Boolean.FALSE; } try { comment.setOppose(comment.getOppose() + 1); commentService.saveComment(comment); } catch (Exception e) { LOGGER.error("反对出错", e); return Boolean.FALSE; } return Boolean.TRUE; } /** * 分页获取评论列表 * * @param comment * @return */ @SuppressWarnings("rawtypes") @Deprecated @ResponseBody @RequestMapping(value = "/comment/listcomment") public Page listCommentByPage(Map<String, Object> map, String nrid, int pageNo, int pageSize) { try { Page page = commentService.listComment(pageNo, pageSize, CommentType.CONTENT.name(), nrid); // map.put("pageComment", page); return page; } catch (Exception e) { LOGGER.error("分页获取评论列表出错", e); } return null; } /** * 查询分页信息，并将信息保存到page，最终显示在comment页面对应的小页面中 * * @param model * @param nrid 内容id * @param pageNo 查询页 * @param pageSize 每页显示条数 * @return */ @SuppressWarnings("rawtypes") @RequestMapping(value = "/comment/comments",method = {RequestMethod.GET ,RequestMethod.POST}) public String listCommentByPage( Model model, String nrid, @RequestParam(value = "pageNo", required = false, defaultValue = "1") int pageNo, @RequestParam(value = "pageSize", required = false, defaultValue = "2") int pageSize) { Page page = null; try { page = commentService.listComment(pageNo, pageSize, CommentType.CONTENT.name(), nrid); model.addAttribute("pageComment", page); } catch (Exception e) { e.printStackTrace(); } return "common/comment-data"; } /** * 查询分页信息，并将信息保存到page，最终显示在comment页面对应的小页面中 * * @param model * @param nrid 内容id * @param pageNo 查询页 * @param pageSize 每页显示条数 * @return */ @SuppressWarnings("rawtypes") @RequestMapping(value = "/comment/comments2",method = {RequestMethod.GET ,RequestMethod.POST}) public String listCommentByPage2( Model model, String nrid, @RequestParam(value = "pageNo", required = false, defaultValue = "1") int pageNo, @RequestParam(value = "pageSize", required = false, defaultValue = "2") int pageSize) { Page page = null; try { page = commentService.listComment(pageNo, pageSize, CommentType.CONTENT.name(), nrid); model.addAttribute("pageComment", page); } catch (Exception e) { e.printStackTrace(); } return "common/comicvedio-data"; } }

Js中调用@ResponseBody返回值，统计剩余评论字数的js

/*用于统计评论剩余字数的js*/ var content = ""; var totalNum = 2000; var comment = (function($){ return { calcuate:function(){ content = $(this).val(); // 算出剩余有多少个字符可以填写 var lengthRemain = totalNum - content.length; // console.log("lengthRemain = " + lengthRemain); if (lengthRemain <= 0) { content = content.substring(0, totalNum); $(this).val(content); lengthRemain = 0; // 设置剩余数值的个数 $("#fontnum").text(lengthRemain); } else { // 设置剩余数值的个数 $("#fontnum").text(lengthRemain); } } } })(jQuery); $(function(){ // 数字控制 $("#fontnum").text(totalNum); // $("#content").on("keyup,keydown,blur,click",calcuate); $("#pinglun").keyup(comment.calcuate); $("#pinglun").keydown(comment.calcuate); $("#pinglun").blur(comment.calcuate); $("#pinglun").click(comment.calcuate); $("#pinglun").mouseout(comment.calcuate); }); /*评论字数统计结束*/ $(function() { $('#comments_fb').click(function() { sendComment(); }); $('#praise').click(function() { contentDz(); }); }); /** * 发表评论 */ function sendComment() { //获取到现有的评论数 var commentNum = parseInt($(".content #pls").text()); //重新设置评论数 $(".content #pls").text((commentNum + 1)); var commentContent = $('#pinglun').val(); if (!commentContent) { alert('请填写评论内容'); return; } if (commentContent.length > 2000) { alert('评论内容不能超过2000个字符'); return; } var sorce = $('#scoreHidden').val(); if (!sorce) { sorce = 0; } var param = { content : commentContent, objectid : contentId, score : sorce } $.ajax({ type : "POST", url : contextPath + "/comment/add", data : $.param(param), //这里success是add返回值 success : function(success) { if (success) { alert("评论发表成功"); $('#pinglun').val('') var pageNo = $("#pageIndexSelect").attr("value"); gotoPage(pageNo); } else { alert("评论发表失败，请登录后发评论"); } } }); } /** * 赞同评论 */ function commentLike(cid, oEvent) { $("#comment-agree").unbind("click"); $.ajax({ type : "POST", url : contextPath + "/comment/commentlike", data : "cid=" + cid, //这里success是赞同返回值 success : function(success) { if (success) { $('#like_' + cid).text(parseInt($('#like_' + cid).text()) + 1); $("#comment-agree").bind("click",commentLike); } } }); } /** * 删除评论 */ function commentDel(cid, oEvent) { $.ajax({ type : "POST", url : contextPath + "/comment/del", data : "cid=" + cid, //这里success是删除返回值 success : function(success) { if (success) { $('#comment_' + cid).remove(); } else { alert("删除评论失败！"); } } }); } /** * 反对评论 */ function commentOppose(cid, oEvent) { $('#oppose_' + cid).text(parseInt($('#oppose_' + cid).text()) + 1); $.ajax({ type : "POST", url : contextPath + "/comment/commentoppose", data : "cid=" + cid, //这里success是反对返回值 success : function(success) { if (success) { } else { $('#oppose_' + cid).text( parseInt($('#oppose_' + cid).text()) - 1); alert(friendTip); } } }); } /** * 重新加载评论 * * @deprecated */ function reloadComment(pageNo) { var param = { nrid : contentId, pageNo : pageNo ? pageNo : 1, pageSize : 5 } $ .ajax({ type : "GET", url : contextPath + "/comment/listcomment", data : $.param(param), //这里Page是/comment/listcomment返回分页值 success : function(page) { if (page) { var lst = page.recordList; // 评论信息 var html = ''; // console.log(lst); for ( var j = 0; j < lst.length; j++) { var one = lst[j]; html += '<dl id="comment_' + one.cid + '">'; html += '<dt><img src="' + contextPath + '/resources/cartoon2/images/content_read/pic03.jpg" width="58" height="58" /></dt>'; html += ' <dd>'; try { if (one.user.userName) { html += '<a href="' + contextPath + '/portal/index/' + one.user.userId + '">' + one.user.userName + '</a>' + '<br/>'; } else { html += '<a href="' + contextPath + '/portal/index/' + one.user.userId + '">匿名</a>' + '<br/>'; } } catch (e) { } html += one.content + '<br/>'; html += '<div class="fr gray" >'; html += new Date(one.commentTime) .format("yyyy-MM-dd hh:mm:ss") html += '<a href="javascript:void(0);" onclick="commentLike(' + one.cid + ',event)"> 赞同</a>（<span id="like_' + one.cid + '">' + one.likecount + '</span>）'; html += '</div>'; html += ' </dd>'; html += '<div class="clear"></div>'; html += ' </dl>'; } $('#commentWrapper').html(html); function commonAppend(i) { var li = ''; if (i == page.pageNum) { li = '<li class="aa1" ><a href="javascript:void(0)" onclick="reloadComment(' + i + ')" >' + i + '</a></li>'; } else { li = '<li ><a href="javascript:void(0)" onclick="reloadComment(' + i + ')" >' + i + '</a></li>'; } return li; } // 分页 var html2 = ''; html2 += '<ul>'; if (page.allRows > 5) { html2 += commonAppend(1); } if (page.allPages != 1) { if (page.allPages <= 5) { for ( var i = 2; i <= page.pageNum; i++) { html2 += commonAppend(i); } } else { if (page.pageNum - 3 > 2) { html2 += '<li>...  </li>'; } for ( var i = page.pageNum - 3; i <= page.pageNum; i++) { if (i <= 1) { continue; } html2 += commonAppend(i); } } if (page.pageNum >= page.allPages - 4 || page.allPages - 4 <= 0) { for ( var i = page.pageNum + 1; i <= page.allPages; i++) { html2 += commonAppend(i); } } else { for ( var i = page.pageNum + 1; i <= page.pageNum + 3; i++) { html2 += commonAppend(i); } html2 += '<li>... </li>'; html2 += commonAppend(page.allPages); } } html2 += '</ul>'; $('#page').html(html2); $('#pls').html(page.allRows); } } }); } /** * 这里是新的评论加载页面 * * @param pageNo */ function gotoPage(pageNo) { $.ajax({ type : "POST", url : contextPath + "/comment/comments", data : { nrid : contentId, pageNo : pageNo ? pageNo : 1, pageSize : 5 }, dataType : 'html', success : function(data) { $("#common-comment-list").children().remove(); $("#common-comment-list").html(data); } }); } /** * 点击确定按钮之后执行的js代码 */ function confirmButton(){ var pageNum = $("#pageNumInput").val(); //这一句专为输入框中获取参数 if(pageNum == "") { alert("对不起，您还没有填写页码!"); } //获得总页数 var pageCount = $("#pageCount").val(); if(pageNum < 1) { this.gotoPage(1); } else if (pageNum > pageCount) { this.gotoPage(pageCount); } else { this.gotoPage(pageNum); } } /** * 点赞 */ function contentDz() { $("#praise").unbind("click"); $.ajax({ type : "POST", url : contextPath + "/content/dz/" + contentId, success : function(success) { if (success) { $('#dzs').text(parseInt($('#dzs').text()) + 1); $("#praise").bind("click",contentDz); } } }); }

2、@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"; } } }