将list集合转成json数组形式

1.导入json_jar.jar包

2.编写一个实体类Note

public class Note implements Serializable{
private String id;
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

}

3.编写一个servlet

public class LoadNoteServlet extends HttpServlet {
public void service(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType(“text/html;charset=utf-8″);
PrintWriter out = response.getWriter();
List<Note> list = new ArrayList<Note>();
Note note = new Note();
note.setId(“01″);
note.setName(“java变量”);
Note note1 = new Note();
note1.setId(“02″);
note1.setName(“ajax应用”);
list.add(note);
list.add(note1);
//将note对象集合转成json数组（静态方法）
JSONArray json = JSONArray.fromObject(list);
out.println(json);
String json_str = json.toString();
out.print(json_str);
out.flush();
out.close();
}

}

4.在web.xml中配置servlet

<servlet>
<servlet-name>LoadNoteServlet</servlet-name>
<servlet-class>servlet.LoadNoteServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>LoadNoteServlet</servlet-name>
<url-pattern>/load.do</url-pattern>

</servlet-mapping>

5.实现的效果

 
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作者：翱翔的鱼
来源：CSDN
原文：https://blog.csdn.net/qq_39924152/article/details/80654180
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