今天调整了下公司项目原来的struts的xml结构,把其中一个由strutc-config.xml独立出来.
结果调一个功能的时候出错.报
java.lang.IllegalArgumentException No destination bean specified
gg了下发现是表单绑定的原因
出错描述： struts 开发中抛出异常java.lang.IllegalArgumentException No destination bean specified
原因： 前面传递过来的表单于后面要显示的表单不一致，或着说前面没绑定表单，而你却使用了如下语句：
// 语句的作用是初始化UserForm让UserForm的值都为空
User user = new User();
UserForm userForm = (UserForm)form; BeanUtils.copyProperties(userForm,user);
处理： 在相对应的action里面加入attribute和name参数绑定到对应的表单就行了
查了下原来的struts-config.xml发现没把form绑定copy到新的xml里.
主要是如下一段:
<form-beans>
<form-bean name="cronTriggerForm" type="com.dragonsoft.********.CronTriggerForm" />
<form-bean name="scheduleJobForm" type="com.dragonsoft.********.ScheduleJobForm" />
</form-beans>
修改后恢复正常.
附找到的一个不错的东东:
java 开发出错笔记 ---powered by jgao
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1.
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出错描述： struts 开发中抛出异常java.lang.IllegalArgumentException No destination bean specified
原因： 前面传递过来的表单于后面要显示的表单不一致，或着说前面没绑定表单，而你却使用了如下语句：
// 语句的作用是初始化UserForm让UserForm的值都为空
User user = new User();
UserForm userForm = (UserForm)form; BeanUtils.copyProperties(userForm,user);
处理： 在相对应的action里面加入attribute和name参数绑定到对应的表单就行了
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2.
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出错描述： struts 开发中抛出异常javax.servlet.ServletException: Cannot retrieve definition for form bean null
原因： 你的页面想跟表单绑定而你的action却没有绑定到表单，所以找不到相应得表单
处理： 在相对应的action里面加入attribute和name参数绑定到对应的表单就行了
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3.
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出错描述： struts 开发中 The requested resource (/jgaoForum/user/userList.do) is not available.
原因： 如果你确定你的路径绝对正确，那么看看你的web.xml是否放在webinf目录下，在不行那么你的web.xml配置正确吗？
< servlet-name > action </ servlet-name >
< servlet-class > org.apache.struts.action.ActionServlet </ servlet-class >
< init-param >
< param-name > config </ param-name >
// 这里路径对吗？
< param-value > /WEB-INF/strutsconfig/struts-config.xml </ param-value >
</ init-param >
< servlet-mapping >
< servlet-name > action </ servlet-name >
< url-pattern > *.do </ url-pattern > // 这里是 *.do 吗？
</ servlet-mapping >
处理： 再不行我也没办法了
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4.
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出错描述： jsp+mysql 中文乱码 .
原因： 编码不匹配
处理：
1. 首先建库和建表的时候在后面加上这句ENGINE=InnoDB DEFAULT CHARSET=gb2312
如果mysql版本有支持gb2312的话那么可以在安装的时候选择gb2312，默认是lant1，这样建库和建表的时候就不用加上ENGINE=InnoDB DEFAULT CHARSET=gb2312了
2. 数据库连接url要如下形式，后面要加上编码方式
a> 直接在java代码里面
jdbc:mysql://localhost:3306/jgaooa?useUnicode=true&characterEncoding=gb2312
b> 放在配置文件（配置文件最好是xml，并且xml文件头也要有编码方式<?xml version="1.0" encoding="GB2312"?>）
jdbc:mysql://localhost:3306/jgaooa?useUnicode=true&characterEncoding=gb2312
3. 每个jsp文件的文件头要加上
<%@ page contentType="text/html;charset=gb2312" %> 不然页面的中文会显示乱码
4. 页面数据之间的传输request，response要加上编码，最好的方式就是通过filter过滤器
过滤器代码如下：该代码由javastudio获得
package org.jgao.soft;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
/**
* 中文过滤器
*/
public class SetCharacterEncodingFilter implements Filter {
// ----------------------------------------------------- Instance Variables
/**
* The default character encoding to set for requests that pass through this
* filter.
*/
protected String encoding = null;
/**
* The filter configuration object we are associated with. If this value is
* null, this filter instance is not currently configured.
*/
protected FilterConfig filterConfig = null;
/**
* Should a character encoding specified by the client be ignored?
*/
protected boolean ignore = true;
// --------------------------------------------------------- Public Methods
/**
* Take this filter out of service.
*/
public void destroy() {
this.encoding = null;
this.filterConfig = null;
}
/**
* Select and set (if specified) the character encoding to be used to
* interpret request parameters for this request.
*
* @param request
* The servlet request we are processing
* @param result
* The servlet response we are creating
* @param chain
* The filter chain we are processing
*
* @exception IOException
* if an input/output error occurs
* @exception ServletException
* if a servlet error occurs
*/
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
// Conditionally select and set the character encoding to be used
if (ignore || (request.getCharacterEncoding() == null)) {
String encoding = selectEncoding(request);
if (encoding != null)
request.setCharacterEncoding(encoding);
}
// Pass control on to the next filter
chain.doFilter(request, response);
}
/**
* Place this filter into service.
*
* @param filterConfig
* The filter configuration object
*/
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.encoding = filterConfig.getInitParameter("encoding");
String value = filterConfig.getInitParameter("ignore");
if (value == null)
this.ignore = true;
else if (value.equalsIgnoreCase("true"))
this.ignore = true;
else if (value.equalsIgnoreCase("yes"))
this.ignore = true;
else
this.ignore = false;
}
// ------------------------------------------------------ Protected Methods
/**
* Select an appropriate character encoding to be used, based on the
* characteristics of the current request and/or filter initialization
* parameters. If no character encoding should be set, return
* <code>null</code>.
* <p>
* The default implementation unconditionally returns the value configured
* by the <strong>encoding</strong> initialization parameter for this
* filter.
*
* @param request
* The servlet request we are processing
*/
protected String selectEncoding(ServletRequest request) {
return (this.encoding);
}
}//
Web.xml 配置文件如下
<? xml version = "1.0" encoding = "UTF-8" ?>
< web-app version = "2.4" xmlns = "http://java.sun.com/xml/ns/j2ee" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >
< filter >
< filter-name > SetCharacterEncodingFilter </ filter-name >
< filter-class > org.jgao.soft.SetCharacterEncodingFilter </ filter-class >
< init-param >
< param-name > encoding </ param-name >
< param-value > GB2312 </ param-value >
</ init-param >
</ filter >
< filter-mapping >
< filter-name > SetCharacterEncodingFilter </ filter-name >
< url-pattern > /* </ url-pattern >
</ filter-mapping >
</ web-app >
再不能搞定那就把 mysql 扔了
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原始链接:http://www.blogjava.net/jgao/archive/2006/06/11/51921.aspx
