SpringMVC后端返回数据到前端代码示例

程序员文章站 2022-04-15 09:21:20

1.返回modelandview对象（.jsp）controller代码：package controller;import java.util.list;import javax.annotatio...

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));
      }
    };
  }

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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