一、實體類
package com.qf.pojo;
public class UserInfo{
private int id;
private String name;
private int age;
private String pwd;
public UserInfo() {
super();
}
public UserInfo(int id, String name, int age, String pwd) {
super();
this.id = id;
this.name = name;
this.age = age;
this.pwd = pwd;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getPwd() {
return pwd;
}
public void setPwd(String pwd) {
this.pwd = pwd;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + age;
result = prime * result + id;
result = prime * result + ((name == null) ? 0 : name.hashCode());
result = prime * result + ((pwd == null) ? 0 : pwd.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
UserInfo other = (UserInfo) obj;
if (age != other.age)
return false;
if (id != other.id)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (pwd == null) {
if (other.pwd != null)
return false;
} else if (!pwd.equals(other.pwd))
return false;
return true;
}
@Override
public String toString() {
return "UserInfo [id=" + id + ", name=" + name + ", age=" + age + ", pwd=" + pwd + "]";
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="hellos" method="post">
<pre>
用戶序列：<input type="text" name="id"/>
用戶姓名；<input type="text" name="name"/>
用戶年齡：<input type="text" name="age"/>
用戶密碼：<input type="text" name="pwd"/>
<input type="submit" value="提交"/>
</pre>
</form>
</body>
</html>package com.qf.util;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ReflectSetObject extends HttpServlet {
protected static Object setObject(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
Object object = null;
try {
//通過反射獲取某個類的Class對象
Class<?> class1 = Class.forName("com.qf.pojo.UserInfo");
//通過無參構造new一個實體對象
object =class1.newInstance();
String field = null;
//獲得此類的所有聲明的字段，即包括public、private和protected，但是不包括父類的申明字段
Field[] fields = class1.getDeclaredFields();
//遍歷該類所有已申明的字段
for (Field fiename : fields) {
//獲取字段類型的Class對象
Class<?> cType = fiename.getType();
//獲取字段類型的名稱
String fieldType = cType.getSimpleName();
//獲取字段名稱
field = fiename.getName();
//截取第一個字母
String first = field.substring(0, 1);
//轉換成大寫
String upper2First = first.toUpperCase();
//替代成首字母大寫的新字符串
String replaceFirst = field.replaceFirst(first, upper2First);
//從view層頁面獲取屬性對應的值（注：view頁面的書寫規範是<input>標籤中的name屬性要和pojo類的屬性相一致）
String parameter = req.getParameter(field);
//判斷所得屬性的類型及是否爲空
if ("String".equals(fieldType) && parameter != null && parameter.length() > 0) {
//調用set方法
Method method1 = class1.getMethod("set" + replaceFirst, String.class);
//將所得的屬性對應值set進對象
method1.invoke(object, parameter);
}
if ("int".equals(fieldType) && parameter != null && parameter.length() > 0) {
Method method1 = class1.getMethod("set" + replaceFirst, int.class);
int name = Integer.parseInt(parameter);
method1.invoke(object, name);
}
}
} catch (Exception e) {
e.printStackTrace();
}
return object;
}
}
四、測試的HttpServlet
package com.qf.util;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.qf.pojo.UserInfo;
@WebServlet("/hellos")
public class TestReflect extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
UserInfo info = (UserInfo) ReflectSetObject.setObject(req, resp);
System.out.println(info);
}
}
注：此方法僅用於servlet開發項目中，獲取頁面數據封裝於對應實體類的方法