spring异常处理实例(登录例子)

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给出一个spring异常处理的简单例子:
spring配置文件Config.xml

<?xmlversion="1.0"encoding="UTF-8"?>

<!DOCTYPEbeansPUBLIC"-//SPRING//DTDBEAN//EN""http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<beanid="viewResolver"

class="org.springframework.web.servlet.view.InternalResourceViewResolver">

<propertyname="viewClass">

<value>

org.springframework.web.servlet.view.JstlView

</value>

</property>

<propertyname="prefix">

</property>

<propertyname="suffix">

</property>

</bean>

<beanid="messageSource"

class="org.springframework.context.support.ResourceBundleMessageSource">

<propertyname="basename"><value>messages</value></property>

</bean>

<beanid="exceptionResolver"

class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">

<propertyname="defaultErrorView">

<value>failure</value>

</property>

<propertyname="exceptionMappings">

<props>

<propkey="java.sql.SQLException">showDBError</prop>

<propkey="java.lang.RuntimeException">showError</prop>

</props>

</property>

</bean>

<beanid="RegisterValidator"

class="net.xiaxin.validator.RegisterValidator"/>

<beanid="RegisterAction"

class="net.xiaxin.action.RegisterAction">

<propertyname="commandClass">

<value>net.xiaxin.reqbean.RegisterInfo</value>

</property>

<propertyname="validator">

<reflocal="RegisterValidator"/>

</property>

<propertyname="formView">

<value>register</value>

</property>

<propertyname="successView">

<value>RegisterSuccess</value>

</property>

</bean>

<beanid="freemarkerConfig"

class="org.springframework.web.servlet.view.freemarker.FreeMarkerConfigurer">

<propertyname="templateLoaderPath">

</property>

</bean>

<beanid="urlMapping"

class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">

<propertyname="mappings">

<props>

<propkey="/login.do">LoginAction</prop>

<propkey="/register.do">RegisterAction</prop>

</props>

</property>

</bean>

<beanid="LoginAction"

class="net.xiaxin.action.LoginAction">

<propertyname="commandClass">

<value>net.xiaxin.action.LoginInfo</value>

</property>

<propertyname="fail_view">

<value>loginfail</value>

</property>

<propertyname="success_view">

</property>

</bean>

</beans>

登录测试代码:

<!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Inserttitlehere</title>

</head>

<body>

<formmethod="post"action="login.do">

<palign="center">登录</p>

<br>

用户名:

<inputtype="text"name="username">

<br>

密  码:

<inputtype="password"name="password">

<br>

<p>

<inputtype="submit"value="提交"name="B1">

<inputtype="reset"value="重置"name="B2">

</p>

</form>

</body>

</html>

loginInfo代码

publicclassLoginInfo...{

privateStringusername;

privateStringpassword;

publicStringgetUsername()...{

returnusername;

}

publicvoidsetUsername(Stringusername)...{

this.username=username;

}

publicStringgetPassword()...{

returnpassword;

}

publicvoidsetPassword(Stringpassword)...{

this.password=password;

}

显示错误页面:showDBError.jsp

<%...@pagelanguage="java"contentType="text/html;charset=gb2312"

pageEncoding="gb2312"%>

<%...@pageimport="java.lang.Exception"%>

<%...@pageimport="java.io.PrintWriter"%>

<!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<metahttp-equiv="Content-Type"content="text/html;charset=gb2312">

<title>Inserttitlehere</title>

</head>

<body>

<%...Exceptionex=(Exception)request.getAttribute("exception");%>

<H2>Exception:<%=ex%></H2>

<%...ex.printStackTrace(newjava.io.PrintWriter(out));%>

</body>

</html>

LoginAction代码

publicclassLoginActionextendsSimpleFormController...{

privateStringfail_view;

privateStringsuccess_view;

protectedModelAndViewonSubmit(Objectcmd,BindExceptionex)throwsException...{

LoginInfologinInfo=(LoginInfo)cmd;

if(login(loginInfo)==0)...{

HashMapresult_map=newHashMap();

result_map.put("logininfo",loginInfo);

ListmsgList=newLinkedList();

msgList.add("msg1");

msgList.add("msg2");

msgList.add("msg3");

result_map.put("messages",msgList);

returnnewModelAndView(this.getSuccess_view(),result_map);

}else...{

SQLExceptione=newSQLException("thisisaexception");

throwe;

//returnnewModelAndView(this.getFail_view());

}

privateintlogin(LoginInfologinInfo)...{

if("oscar".equalsIgnoreCase(loginInfo.getUsername())&&"123456".equals(loginInfo.getPassword()))...{

return0;

}

return1;

}

publicStringgetFail_view()...{

returnfail_view;

}

publicvoidsetFail_view(Stringfail_view)...{

this.fail_view=fail_view;

}

publicStringgetSuccess_view()...{

returnsuccess_view;

}

publicvoidsetSuccess_view(Stringsuccess_view)...{

this.success_view=success_view;

}

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JSP自定义标签入门实例 | 表单的提交方式POST和GET

2007-09-21 10:41
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