HTML代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<style type="text/css">
.school{
background-color: azure;
width: 250px;
height: 130px;
padding: 5px;
}
.student{
background-color:coral;
width: 250px;
height: 60px;
padding: 5px;
}
</style>
<script src="./js/react.js"></script>
<script src="./js/react-dom.js"></script>
<script src="./js/babel.min.js"></script>
<script src="./js/jquery.min.js"></script>
<script src="./js/AjaxApp2.js" type="text/babel"></script>
<script src="./js/MyWeather.js" type="text/babel"></script>
<body>
<div id="app">111</div>
<script type="text/babel">
ReactDOM.render(
<AjaxApp2/>,
document.getElementById("app")
);
</script>
</body>
</html>
java代码：
package com.nf.web;
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/GetOtherJSON")
public class GetOtherJSON extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
Thread.sleep(3000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//javascript默认取不了跨域的json，但是java的httpURLConnection是可以的
String url_str = "http://www.weather.com.cn/data/cityinfo/101010100.html";
//url_str= url_str+"?city="+URLEncoder.encode("南宁", "UTF-8");
System.out.println(url_str);
//new一个URL路径
URL url = new URL(url_str);
HttpURLConnection conn = null;
conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("GET");
conn.setUseCaches(false);//为了防止访问脏数据
//第一步：上传参数（可以没有）
/*
OutputStream os = conn.getOutputStream();//获取一个输出流
DataOutputStream dos = new DataOutputStream(os);
dos.writeBytes("city="+URLEncoder.encode("北京", "UTF-8"));
dos.flush();
dos.close();
*/
//第二步，开始下载对方服务器影响的内容
if( conn.getResponseCode()==HttpURLConnection.HTTP_OK){
System.out.println("访问远程服务器正常");
InputStream is = conn.getInputStream();
InputStreamReader isr = new InputStreamReader(is,"UTF-8");
BufferedReader br = new BufferedReader(isr);
String result = "";
String readOneLine = null;
StringBuffer sb = new StringBuffer();
while((readOneLine=br.readLine())!=null){
sb.append(readOneLine);
}
result = sb.toString();
System.out.println("对方服务器响应的内容："+result);
br.close();
isr.close();
is.close();
conn.disconnect();
/*以下6行代码复制粘贴进来就可以了*/
response.setContentType("text/json;charset=UTF-8;pageEncoding=UTF-8");
response.setCharacterEncoding("UTF-8");
request.setCharacterEncoding("UTF-8");
//浏览器和缓存服务器都不应该缓存页面信息
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
PrintWriter out = response.getWriter();
out.print(result);
}else{
System.out.println("访问远程服务器有异常:"+conn.getResponseCode());
}
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
}
js代码：AjaxApp.js:
var AjaxApp2 = React.createClass({
getInitialState:function(){
return{
cityName:'loding...',
temp1:'loding',
temp2:'loding',
img1:'loding.gif',
img2:'loding.gif',
ptime:'loding'
}
},
componentDidMount:function(){
$.ajax({
//url:'test.json',
url:'GetOtherJSON',
type:'GET',
//data:{'city':'北京'},
dataType:'json',
timeout:4000,
success:function(result){
//alert(result.weatherinfo);
this.setState({
cityName:result.weatherinfo.city,
temp1:result.weatherinfo.temp1,
temp2:result.weatherinfo.temp2,
img1:'http://m.weather.com.cn/img/'+result.weatherinfo.img1,
img2:'http://m.weather.com.cn/img/'+result.weatherinfo.img2,
ptime:result.weatherinfo.ptime
});
}.bind(this),
error:function(XMLHttpRequest, textStatus, errorThrown){
alert('服务器忙，请不要说脏话，理论上大家都是文明人');
alert(textStatus+XMLHttpRequest.status);
}
});
//this.setState({studentName:'张学友'});
},
render:function(){
return <div>
<MyWeather cityName={this.state.cityName} temp1={this.state.temp1} temp2={this.state.temp2} img1={this.state.img1} img2={this.state.img2} ptime={this.state.ptime}></MyWeather>
</div>;
}
});
MyWeather.js
var MyWeather = React.createClass({
getDefaultProps:function(){
return{
cityName:'加载...',
temp1:'loding',
temp2:'loding',
img1:'loding.gif',
img2:'loding.gif',
ptime:'loding'
}
},
render:function(){
return <div className="school">
城市名字:{this.props.cityName}<br/>
最低温：{this.props.temp1}<br/>
最高温：{this.props.temp2}<br/>
<img src={this.props.img1} width="21" height="15"/><br/>
<img src={this.props.img2} width="21" height="15"/><br/>
最后更新时间:{this.props.ptime}
</div>;
}
});