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SpringMVC后端返回数据到前端代码示例

作者：筱菜鸟　　发布时间：2023-06-20 13:12:47　

标签：Spring,MVC,后端,数据,前端

1.返回ModelAndView对象（.jsp）

controller代码：

package controller;

import java.util.List;

import javax.annotation.Resource;

import model.Comment;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import service.CommentService;

@Controller
//@RequestMapping("comment")
public class CommentController {
@Resource private CommentService commentService;
@RequestMapping(value="showComments")
public ModelAndView test(){
ModelAndView mav = new ModelAndView();
List<Comment> comments = commentService.selectAllComment();
for(Comment com:comments){
System.out.println(com.getC_text());
}
mav.addObject("msg",comments);
mav.setViewName("textIndex.jsp");
return mav;
}
}

jsp页面代码

<％@ page language="java" import="java.util.*" pageEncoding="UTF-8"％>
<％
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
％>

<％@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" ％>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<％=basePath％>" rel="external nofollow" >

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
<c:forEach items="${msg}" var="com">
${com.getUid()}:${com.getC_text()}:${com.getC_date()}<br>
</c:forEach>
</body>
</html>

2.返回JSON数据到html页面

利用ajax接收数据

ajax({
method:'post',
url:'http://localhost:8080/graduate/showComments.do',
data:'null',
success:function(response){
console.log(response);
}
})

controller

@Controller
//@RequestMapping("comment")
public class CommentController {
@Resource private CommentService commentService;

@RequestMapping(value="showComments")
@ResponseBody
public List<Comment> test(){
List<Comment> comments = commentService.selectAllComment();
for(Comment com:comments){
System.out.println(com.getC_text());
}
return comments;
}
}

3.顺便记录一下原生ajax,方便以后使用

function ajax(opt) {
opt = opt || {};
opt.method = opt.method.toUpperCase() || 'POST';
opt.url = opt.url || '';
opt.async = opt.async || true;
opt.data = opt.data || null;
opt.success = opt.success || function () {};
var xmlHttp = null;
if (XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
else {
xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
}var params = [];
for (var key in opt.data){
params.push(key + '=' + opt.data[key]);
}
var postData = params.join('&');
if (opt.method.toUpperCase() === 'POST') {
xmlHttp.open(opt.method, opt.url, opt.async);
xmlHttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded;charset=utf-8');
xmlHttp.send(postData);
}
else if (opt.method.toUpperCase() === 'GET') {
xmlHttp.open(opt.method, opt.url + '?' + postData, opt.async);
xmlHttp.send(null);
}
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
opt.success(JSON.parse(xmlHttp.responseText));
}
};
}

来源：https://www.cnblogs.com/Rong-Xiu/p/12742494.html

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SpringMVC后端返回数据到前端代码示例

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