struts2 请求参数接收
1. 采用基本类型接受请求参数(get/post)
在Action类中定义与请求参数同名的属性，struts2便能自动接收请求参数并赋予给同名的属性。
请求路径：http://localhost:8080/action/register.action?id=33
public class HelloWorldAction {
private Integer id;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
}
2. 采用复合类型接受请求参数
请求路径：http://localhost:8080/action/register.action?id=79
public class HelloWorldAction {
private Person person;
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
}
获取Bean属性的原理：
Struts2首先通过反射技术调用Person的默认构造器创建person的实例，然后再通过反射技术调用person中与请求参数同名的属性的setter方法，来获取请求参数数值。
实体bean
package com.ljq.bean;
public class Person {
private String name;
private Integer id;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
}
HelloWorldAction类
package com.ljq.action;
import com.ljq.bean.Person;
public class HelloWorldAction {
//基本类型请求参数
private Integer id;
private String name;
//复合类型请求参数
private Person person;
public String execute(){
return "success";
}
public Person getPerson() {
return person;
}
public void setPerson(Person person) {
this.person = person;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
index.jsp请求页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> </head> <body> <!-- get方法发送，如果是中文则会出现乱码，post不会，好像struts2.1.8有修正此问题 基本类型get请求参数: http://localhost:8083/struts2/control/employee/executeHelloWorld.do?id=1&name= zhangsan 复合类型get请求参数: http://localhost:8083/struts2/control/employee/executeHelloWorld.do?person.id=2&person.name=lisi http://localhost:8083/struts2/control/employee/executeHelloWorld.do?id=1&name=zhangsan&person.id=2&person.name=lisi --> <!-- post方法发送 --> <form action="<%=request.getContextPath()%>/control/employee/executeHelloWorld.do" method="post"> <!-- 基本类型请求参数 --> id:<input type="text" name="id"><br/> name:<input type="text" name="name"><br/> <!-- 复合类型请求参数 --> person.id:<input type="text" name="person.id"><br/> person.name:<input type="text" name="person.name"><br/> <input type="submit" value="发送"/> </form> </body> </html>
显示页面
<%@ page language="java" import="java.util.*,java.net.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'message.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
</head>
<body>
<!-- 输出基本类型请求参数 -->
id=${id}<br/>
name=${name}<br/>
<!-- 输出复合类型请求参数 -->
person.id=${person.id }<br/>
person.name=${person.name }<br/>
</body>
</html>
struts.xml配置文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.i18n.encoding" value="UTF-8" />
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.action.extension" value="do,go" />
<package name="employee" namespace="/control/employee" extends="struts-default">
<action name="*HelloWorld" class="com.ljq.action.HelloWorldAction" method="{1}">
<result name="success">/WEB-INF/page/message.jsp</result>
</action>
</package>
</struts>
