struts2之请求参数接收

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 >