struts1校驗和JSTL表達式的迭代

1、User類：

@SuppressWarnings("serial")
public class User implements Serializable {

    private String username;
    private String password;
    private int[] specialities;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int[] getSpecialities() {
        return specialities;
    }

    public void setSpecialities(int[] specialities) {
        this.specialities = specialities;
    }

}

2、Speciality類：

public class Speciality {

    private int id;
    private String name;

    public Speciality() {
    }

    public Speciality(int id, String name) {
        this.id = id;
        this.name = name;
    }

    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;
    }
}

3、UserForm類：

public class UserForm extends ActionForm {

    private static final long serialVersionUID = 1L;
    private User user = new User(); // 必須初始化
    private String password2;

    public String getPassword2() {
        return password2;
    }

    public void setPassword2(String password2) {
        this.password2 = password2;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    @Override
    public ActionErrors validate(ActionMapping mapping,
            HttpServletRequest request) {
        ActionErrors errors = new ActionErrors();
        String name = user.getUsername();
        if (null == name || "".equals(name.trim())) {
            errors.add("username", new ActionMessage("error.username"));
        }
        if (!password2.equals(user.getPassword())) {
            errors.add("password", new ActionMessage("error.password"));
        }
        return errors;
    }

}

4、IndexAction類：

public class IndexAction extends Action {

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        saveToken(request); // 保存sessionId
        request.setAttribute("specialities", getSpecialities());
        return mapping.findForward("index");
    }

    private Speciality[] getSpecialities() {
        return new Speciality[] { new Speciality(1, "footbal"),
                new Speciality(2, "basketball"),
                new Speciality(3, "volleyball"),
                new Speciality(4, "ping-pong"), new Speciality(5, "baseball"), };
    }
}

5、LoginAction類：

public class LoginAction extends Action {

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        UserForm userForm = (UserForm) form;
        String username = userForm.getUser().getUsername();
        ActionMessages errors = new ActionMessages();
        if (null != username && !"".equals(username.trim())
                && "wgy".equals(username)) {
            errors.add("username", new ActionMessage("error.repeated"));
            saveErrors(request, errors);
            return mapping.getInputForward();
        }
        return mapping.findForward("success");
    }

}

6、struts-config.xml配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 1.3//EN"
    "http://jakarta.apache.org/struts/dtds/struts-config_1_3.dtd">
<struts-config>
    <form-beans>
        <form-bean name="userForm" type="com.wgy.struts1.UserForm" />
    </form-beans>
    <action-mappings>
        <action path="/login" type="com.wgy.struts1.LoginAction" name="userForm"
            input="/index.do"> <!-- 這裏index後必須帶.do -->
            <forward name="success" path="/success.jsp"></forward>
        </action>
        <action path="/index" type="com.wgy.struts1.IndexAction" name="userForm"
            validate="false">
            <forward name="index" path="/index.jsp"></forward>
        </action>
    </action-mappings>
    <message-resources parameter="com.wgy.resources.Application" />
</struts-config>

7、Application.proprties文件（位於com.wgy.resources下）：

error.username=<h6><font color="red">\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7A\uFF01</font></h6>
error.password=<h6><font color="red">\u4E24\u6B21\u5BC6\u7801\u5FC5\u987B\u4E00\u81F4\uFF01</font></h6>
error.repeated=<h6><font color="red">\u7528\u6237\u540D\u91CD\u590D\uFF01</font></h6>

8、index.jsp頁面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!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>index.jsp</title>
</head>
<body>
    <form action="login.do" method="post">
        username:<input type="text" name="user.username"
            value="${userForm.user.username }" />
        <html:errors property="username" />
        <br />
        <!-- 這裏User對象保存在session範圍，需將其序列化 -->
        passwrod:<input type="text" name="user.password"
            value="${userForm.user.password }" /> <br />
        passwrod2:<input type="text" name="password2"
            value="${userForm.password2 }" />
        <html:errors property="password" />
        <br />
        <%-- 愛好：<input type="checkbox" name="user.specialities" value="1" />football
        <input type="checkbox" name="user.specialities" value="2" />basketball
        <input type="checkbox" name="user.specialities" value="3" />volleyball
        <input type="checkbox" name="user.specialities" value="4" />ping-pong
        <input type="checkbox" name="user.specialities" value="5" />baseball <br /> --%>
        愛好：
        <c:forEach items="${specialities }" var="speciality">
            <!-- 校驗失敗時，已選中的複選框仍被選中 -->
            <c:remove var="checked"/>
            <c:forEach items="${userForm.user.specialities }" var="hasSpeciality">
                <c:if test="${speciality.id==hasSpeciality }">
                    <c:set var="checked" value='checked="checked"' />
                </c:if>
            </c:forEach>
            <input type="checkbox" name="user.specialities"
                value="${speciality.id }" ${checked } />${speciality.name }
        </c:forEach>
        <br /> <input type="submit" value="登錄" />
        <hr />
        <c:forEach items="${sessionScope }" var="oneAttr">
            ${oneAttr.key } --> ${oneAttr.value } <br />
        </c:forEach>
    </form>
</body>
</html>

9、success.jsp頁面：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>success.jsp</title>
</head>
<body>
    ${userForm.user.username } <br />
    <c:forEach items="${userForm.user.specialities }" var="speciality">
        ${speciality }
    </c:forEach>
    <hr />
    <c:forEach items="${requestScope }" var="oneAttr">
        ${oneAttr.key } --> ${oneAttr.value } <br />
    </c:forEach>
</body>
</html>

小結：

1) 本例中JSTL表達式迭代的應用；

2) struts-config.xml文件中action的attribute屬性：爲web域中FormBean起的別名，默認值和name屬性的值一致；

3) action的scope屬性：默認值爲session；

4) action的input屬性：表單校驗失敗時，跳轉的地址；

5) <html:errors>標籤使用時，需配置資源文件，由此引出struts1的國際化。