使用JSON格式提交數據到服務端的實例代碼

2019-11-19 14:04:37

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準備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方式提交數據</title> <script type="text/javascript" src="jquery.min.js"></script> </head> <body>  <form >   名稱：<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，請在Tomcat控制臺查看服務端接收到的數據");    });   });  </script> </body> </body> </html> <!DOCTYPE html><html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>用AJAX以JSON方式提交數據</title> <script type="text/javascript" src="jquery.min.js"></script> </head> <body>  <form >   名稱：<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，請在Tomcat控制臺查看服務端接收到的數據");   });  });  </script> </body> </body></html>

JSON.stringify函數的作用是將一個javascript對象，轉換為JSON格式的字符串。

準備SubmitServlet用來接收數據

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("服務端接收到的數據是：" +data);   JSONObject json=JSONObject.fromObject(data);   System.out.println("轉換為JSON對象之后是："+ json);   Hero hero = (Hero)JSONObject.toBean(json,Hero.class);   System.out.println("轉換為Hero對象之后是："+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("服務端接收到的數據是：" +data);  JSONObject json=JSONObject.fromObject(data);   System.out.println("轉換為JSON對象之后是："+ json);  Hero hero = (Hero)JSONObject.toBean(json,Hero.class);   System.out.println("轉換為Hero對象之后是："+hero); } }

1. 獲取瀏覽器提交的字符串

2. 把字符串轉換為JSON對象

3. 把JSON對象轉換為Hero對象

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>啟動tomcat訪問http://127.0.0.1:8080/項目名/submit.html