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Use JSON to transfer data to the server

php中世界最好的语言Original: 2018-06-12 10:24:161191browse

This time I will introduce to you what are the precautions for using JSON to transmit data to the server. The following is a practical case, let's take a look.

Prepare Hero.java

public class Hero { 
 private String name; 
 private int hp; 
 public String getName() { 
  return name; 
 }  public void setName(String name) { 
  this.name = name; 
 } 
 public int getHp() { 
  return hp; 
 } 
 public void setHp(int hp) { 
  this.hp = hp; 
 } 
 @Override 
  public String toString() { 
   return "Hero [name=" + name + ", hp=" + hp + "]"; 
  } 
} 
public class Hero {
 private String name;
 private int hp;
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 public int getHp() {
 return hp;
 }
 public void setHp(int hp) {
 this.hp = hp;
 }
 @Override
 public String toString() {
   return "Hero [name=" + name + ", hp=" + hp + "]";
  }
}submit.html文件
[html] view plain copy print?<!DOCTYPE html> 
<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>用AJAX以JSON方式提交数据</title> 
<script type="text/javascript" src="jquery.min.js"></script> 
</head> 
<body> 
 <form > 
  名称：<input type="text" id="name"/><br/> 
  血量：<input type="text" id="hp"/><br/> 
  <input type="button" value="提交" id="sender">  
 </form> 
 <p id="messagep"></p> 
 <script> 
 $('#sender').click(function(){ 
  var name=document.getElementById('name').value; 
  var hp=document.getElementById('hp').value; 
  var hero={"name":name,"hp":hp}; 
  var url="submitServlet"; 
  $.post( 
    url, 
    {"data":JSON.stringify(hero)}, 
    function(data) { 
      alert("提交成功，请在Tomcat控制台查看服务端接收到的数据"); 
   });  
 }); 
 </script> 
</body> 
</body> 
</html> 
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
<title>用AJAX以JSON方式提交数据</title> 
<script type="text/javascript" src="jquery.min.js"></script> 
</head> 
<body> 
 <form > 
  名称：<input type="text" id="name"/><br/> 
  血量：<input type="text" id="hp"/><br/> 
  <input type="button" value="提交" id="sender"> 
 </form> 
 <p id="messagep"></p> 
 <script> 
 $('#sender').click(function(){ 
  var name=document.getElementById('name').value; 
  var hp=document.getElementById('hp').value; 
  var hero={"name":name,"hp":hp}; 
  var url="submitServlet"; 
  $.post(
   url, 
   {"data":JSON.stringify(hero)},
   function(data) { 
    alert("提交成功，请在Tomcat控制台查看服务端接收到的数据");
   }); 
 }); 
 </script> 
</body> 
</body>
</html>

The function of JSON.stringify function is to convert a javascript object into a string in JSON format.

Prepare SubmitServlet to receive data

import java.io.IOException; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
import net.sf.json.JSONObject; 
public class SubmitServlet extends HttpServlet { 
 protected void service(HttpServletRequest request, HttpServletResponse response) 
   throws ServletException, IOException { 
  String data =request.getParameter("data"); 
  System.out.println("服务端接收到的数据是：" +data); 
  JSONObject json=JSONObject.fromObject(data); 
  System.out.println("转换为JSON对象之后是："+ json); 
  Hero hero = (Hero)JSONObject.toBean(json,Hero.class); 
  System.out.println("转换为Hero对象之后是："+hero); 
 } 
} 
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject; 
public class SubmitServlet extends HttpServlet { 
 protected void service(HttpServletRequest request, HttpServletResponse response) 
   throws ServletException, IOException {
  String data =request.getParameter("data");
  System.out.println("服务端接收到的数据是：" +data);
  JSONObject json=JSONObject.fromObject(data); 
  System.out.println("转换为JSON对象之后是："+ json);
  Hero hero = (Hero)JSONObject.toBean(json,Hero.class); 
  System.out.println("转换为Hero对象之后是："+hero);
 } 
}

1. Get the string submitted by the browser

2. Convert the string into a JSON object

3 . Convert JSON object to Hero object

Finally configure web.xml

<?xml version="1.0" encoding="UTF-8"?> 
<web-app> 
  <servlet> 
  <servlet-name>SubmitServlet</servlet-name> 
  <servlet-class>SubmitServlet</servlet-class> 
 </servlet> 
 <servlet-mapping> 
  <servlet-name>SubmitServlet</servlet-name> 
  <url-pattern>/submitServlet</url-pattern> 
 </servlet-mapping> 
</web-app> 
<?xml version="1.0" encoding="UTF-8"?>
<web-app>
 <servlet>
  <servlet-name>SubmitServlet</servlet-name>
  <servlet-class>SubmitServlet</servlet-class>
 </servlet>
 <servlet-mapping>
  <servlet-name>SubmitServlet</servlet-name>
  <url-pattern>/submitServlet</url-pattern>
 </servlet-mapping>

Start tomcat to access http://127.0.0.1:8080/project name/submit .html

See the transmitted data in the tomcat console

I believe you have mastered it after reading the case in this article For more exciting methods, please pay attention to other related articles on the php Chinese website!

Use JSON to transfer data to the server

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