使用JSON格式提交数据到服务端的实例代码

程序员文章站 2022-05-01 17:14:01

准备hero.java public class hero { private string name; private int hp; pub...

准备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> 
 <div id="messagediv"></div> 
 <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> 
 <div id="messagediv"></div> 
 <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>

json.stringify函数的作用是将一个javascript对象，转换为json格式的字符串。

准备submitservlet用来接收数据

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. 获取浏览器提交的字符串

2. 把字符串转换为json对象

3. 把json对象转换为hero对象

最后配置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>

</web-app>启动tomcat访问项目名/submit.html

使用JSON格式提交数据到服务端的实例代码