这篇文章主要讲解了SpringMVC后端怎么返回数据到前端，内容清晰明了，对此有兴趣的小伙伴可以学习一下，相信大家阅读完之后会有帮助。
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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" >
-->
</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));
}
};
}看完上述内容，是不是对SpringMVC后端怎么返回数据到前端有进一步的了解，如果还想学习更多内容，欢迎关注亿速云行业资讯频道。
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