使用Webwork OGNL案例

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#webwork #iterator #import #integer #session #action

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本文介绍了一个使用OGNL表达式从Action传递数据到JSP页面的例子，并探讨了如何正确遍历Set集合的问题。

编写javaBean:

package ch8;

import java.util.List;

import java.util.Map;

import java.util.Set;

public class Student {

private String name;

private boolean man;

private Classroom classroom;

private List book;

private Map food;

private Set tools;

public List getBook() {

return book;

}

public void setBook(List book) {

this.book = book;

}

public Classroom getClassroom() {

return classroom;

}

public void setClassroom(Classroom classroom) {

this.classroom = classroom;

}

public Map getFood() {

return food;

}

public void setFood(Map food) {

this.food = food;

}

public boolean isMan() {

return man;

}

public void setMan(boolean man) {

this.man = man;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Set getTools() {

return tools;

}

public void setTools(Set tools) {

this.tools = tools;

}

package ch8;

public class Classroom {

private int number;

private String classname;

public String getClassname() {

return classname;

}

public void setClassname(String classname) {

this.classname = classname;

}

public int getNumber() {

return number;

}

public void setNumber(int number) {

this.number = number;

}

Action:

package ch8;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import com.opensymphony.webwork.interceptor.ServletRequestAware;

import com.opensymphony.webwork.interceptor.SessionAware;

import com.opensymphony.xwork.ActionSupport;

public class TestOGNL extends ActionSupport implements SessionAware,ServletRequestAware{

private List members=new ArrayList();

private String type;

HttpServletRequest request=null;

Map session=null;

public void setSession(Map session) {

this.session=session;

//或者HttpServletRequest request=ActionContext.getContext().get(ServletActionContext.HTTP_REQUEST);

}

public void setServletRequest(HttpServletRequest request) {

this.request=request;

}

public List getMembers() {

return members;

}

public void setMembers(List members) {

this.members = members;

}

public String getType() {

return type;

}

public void setType(String type) {

this.type = type;

}

public TestOGNL(){

//构造测试数据

members.add(new Integer(1));

members.add(new Integer(2));

members.add(new Integer(3));

type="webwork";

}

public String execute() throws Exception {

// 构造测试数据

Classroom classroom=new Classroom();

classroom.setClassname("javeEE");

classroom.setNumber(22);

Student stu=new Student();

stu.setName("gaoxiang");

stu.setClassroom(classroom);

stu.setMan(true);

List books=new ArrayList();

books.add("j2se");

books.add("j2ee");

books.add("j2me");

stu.setBook(books);

Map foods=new HashMap();

foods.put("1", "apple");

foods.put("2", "orange");

stu.setFood(foods);

Set tools=new HashSet();

tools.add("bomb");

tools.add("rocket");

tools.add("wood");

stu.setTools(tools);

request.setAttribute("student", stu);

session.put("student", stu);

return SUCCESS;

}

xwork.xml

<result name="success">/ch8/list-students.jsp</result>

</action>

JSP:

<%@ page language="java" contentType="text/html; charset=GB18030"

pageEncoding="GB18030"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<%@ taglib uri="webwork" prefix="ww"%>

<title>Insert title here</title>

</head>

<body>

从Action中得到的数据

type:<ww:property value="type"/>

members:

<ww:iterator value="members" status="status">

<ww:property value="members.get(#status.Index)"/>

</ww:iterator>

从request中得到的数据

Student name:<ww:property value="#request.student.name"/>

Student is man:<ww:property value="#request.student.man"/>

Student books:

<ww:iterator value="#request.student.book" status="status">

<ww:property value="#request.student.book.get(#status.Index)"/>

</ww:iterator>

Student food:

<ww:property value="#request.student.food.get("1")"/>

<ww:property value="#request.student.food.get("2")"/>

Student classroom;

<ww:property value="#request.student.classroom.classname"/>

<ww:property value="#request.student.classroom.number"/>

Student tools:

不知道该如何去遍历set,我用下面的方式，总是输出set.size()个set中最后的数值

<ww:iterator value="#request.student.tools.iterator" status="status">

<ww:property value="#request.student.tools.iterator.next"/>

</ww:iterator>

从session中得到的数据和从request中一致，只需要把相应的request换成session

Student name:<ww:property value="#session.student.name"/>

Student is man:<ww:property value="#session.student.man"/>

Student books:

<ww:iterator value="#session.student.book" status="status">

<ww:property value="#session.student.book.get(#status.Index)"/>

</ww:iterator>

Student classroom;

<ww:property value="#session.student.classroom.classname"/>

<ww:property value="#session.student.classroom.number"/>

Student food:

<ww:property value="#session.student.food.get("1")"/>

<ww:property value="#session.student.food.get("2")"/>

Student tools:

不知道该如何去遍历set,我用下面的方式，总是输出set.size()个set中最后的数值

<ww:iterator value="#session.student.tools.iterator" status="status">

<ww:property value="#session.student.tools.iterator.next"/>

</ww:iterator>

</body>

</html>

运行结果：

从Action中得到的数据
type:webwork
members: 1 2 3

从request中得到的数据
Student name:gaoxiang
Student is man:true
Student books: j2se j2ee j2me
Student food: apple orange
Student classroom; javeEE 22
Student tools: 不知道该如何去遍历set,我用下面的方式，总是输出set.size()个set中最后的数值 wood wood wood

从session中得到的数据和从request中一致，只需要把相应的request换成session
Student name:gaoxiang
Student is man:true
Student books: j2se j2ee j2me
Student food: apple orange
Student tools: 不知道该如何去遍历set,我用下面的方式，总是输出set.size()个set中最后的数值 wood wood wood