（六）利用JackSon工具将JSON文件和对象互转
1. 需要下载JackSon工具，并导入到：
2. 编写html页面：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户注册</title>
<script type="text/javascript" src="./js/lib/jquery.js"></script>
<script type="text/javascript">
/**
* 验证两次输入密码是否一致
*/
$(function(){
$('#yanzheng').blur(function(){
if($('#passwd')!=null){ //第一次输入的密码不为空
if($('#passwd').val()==$('#yanzheng').val()){
}else{
alert("两次输入的密码不一样");
}
}else{ //第一次输入的密码为空
}
});
});
</script>
</head>
<body>
<div style="position:relative;left:50%">
<h1 style=>用户注册</h1></div>
<div style="position:relative;left:45%">
<form action="servlet/regist" method="post">
用户名:<input type="text" name="userName"/><br/>
密 码:<input type="password" name="passWd" id="passwd" /><br/>
确认密码:<input type="password" name="rePassWd" id="yanzheng"/><br/>
性 别:<input type="radio" name="sex" value="男" />男
<input type="radio" name="sex" value="女" />女<br/>
<input type="submit" value="注册" />
</form>
</div>
</body>
</html>
3. 编写 javabean
解析： bo是业务层，bo对象属性与用户输入的信息一一对应，本例用户输入的信息有userName、passWd、sex，所以javabean的User对象也有这三个属性。
package bo;
public class User {
private String userName;
private String passWd;
private String sex;
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassWd() {
return passWd;
}
public void setPassWd(String passWd) {
this.passWd = passWd;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}
4. 编写servlet
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.fasterxml.jackson.databind.ObjectMapper;
import bo.User;
/**
* Servlet implementation class Register
*/
public class Register extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public Register() {
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("UTF-8"); //post方式用这种设置编码，如果是get方式，则用string.getBytes("ISO8859-1","utf-8")方法设置编码。
response.setContentType("text/html;charset=UTF-8");
//从浏览器获取用户信息
String userName=request.getParameter("userName");
String passWord=request.getParameter("passWd");
String sex=request.getParameter("sex");
//将用户信息装入javabean里
User user=new User();
user.setUserName(userName);
user.setPassWd(passWord);
user.setSex(sex);
//将javabean转为json对象
ObjectMapper mapper = new ObjectMapper();
String json=mapper.writeValueAsString(user);
PrintWriter out=response.getWriter();
out.print(json);
out.close();
}
}
结果：
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