struts2从零开始（四）-优快云博客

本文介绍如何使用Struts2实现文件上传功能，并详细解释了上传过程中的配置及实现代码。此外，还介绍了两种自定义类型转换器的方法及其在Struts2中的配置。

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知识点：1、文件上传
2、类型转换

1、文件上传：
1.1、 jsp页面代码：

<body>

          <form action="upload.action" method="post" enctype="multipart/form-data">
             <input type="file" name="photo">
             <input type="submit" value="上传">

          </form>


  </body>

1.2、 struts.xml中的代码：

<package name="mypackage" extends="struts-default">

	        <action name="upload" class="cn.zhuojingxinxi.web.UploadAction">
	            <interceptor-ref name="fileUpload"></interceptor-ref>
	            <interceptor-ref name="defaultStack"></interceptor-ref>
	                     <result name="success">/success.jsp</result>
	                     <result name="input">/error.jsp</result>
	        </action>

	     </package>

1.3、 action中的代码：

package cn.zhuojingxinxi.web;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport{
	private File  photo;
	private String photoFileName;
	private String photoContentType;

	public File getPhoto() {
		return photo;
	}
	public void setPhoto(File photo) {
		this.photo = photo;
	}

	public String getPhotoFileName() {
		return photoFileName;
	}

	public void setPhotoFileName(String photoFileName) {
		this.photoFileName = photoFileName;
	}
	public String getPhotoContentType() {
		return photoContentType;
	}

	public void setPhotoContentType(String photoContentType) {
		this.photoContentType = photoContentType;
	}


	public String execute(){
//		System.out.println(photo.length());
//		System.out.println(photoFileName);
//		System.out.println(photoContentType);
		String path=ServletActionContext.getServletContext().getRealPath("/");
		  try {
			FileInputStream fis=new FileInputStream(photo);

			FileOutputStream fos=new FileOutputStream(path+photoFileName);

		    	byte[] b=new byte[512];
		    	int length=-1;
			  try {
				while((length=fis.read(b))!=-1){

					fos.write(b, 0, length);

					fos.flush();
				  }
				fos.close();
				fis.close();
			} catch (IOException e) {

				e.printStackTrace();
			}
		} catch (FileNotFoundException e) {

			e.printStackTrace();
		}


		return null;

	}

}

2、类型转换
2.1编写转换器，方式一继承DefaultTypeConverter（代码如下）

package cn.zhuojingxinxi.util;

import java.util.Map;

import cn.zhuojingxinxi.entity.Point;

import ognl.DefaultTypeConverter;

public class PointConvert extends DefaultTypeConverter{

	@Override
	public Object convertValue(Map context, Object value, Class toType) {


		if(toType==Point.class){
		    System.out.println("转入");
			  String[] str=(String[])value;
		      String[] s=str[0].split(",");
		      Point point=new Point();
		      point.setPointX(Integer.parseInt(s[0]));
		      point.setPointY(Integer.parseInt(s[1]));
			  return  point;

		}else{
			System.out.println("转出");
			Point p=(Point)value;
			 StringBuilder sb=new StringBuilder();
			 sb.append(p.getPointX()+","+p.getPointY());
			 return sb.toString();

		}

	}

}

2.2、方式二继承StrutsTypeConverter（代码如下）

package cn.zhuojingxinxi.util;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import cn.zhuojingxinxi.entity.Point;

import ognl.DefaultTypeConverter;

public class PointConvert2 extends StrutsTypeConverter{


	@Override
	public Object convertFromString(Map arg0, String[] arg1, Class arg2) {

		  String[] str=arg1;
	      String [] s=	str[0].split(",");
	      Point point=new Point();
	      point.setPointX(Integer.parseInt(s[0]));
	      point.setPointY(Integer.parseInt(s[1]));
		  return  point;

	}

	@Override
	public String convertToString(Map arg0, Object arg1) {
		 Point p=(Point)arg1;
		 StringBuilder sb=new StringBuilder();
		 sb.append(p.getPointX()+","+p.getPointY());
		 return sb.toString();

	}

}

2.3、struts.xml中action节点的配置信息（代码如下）

 <action name="convert" class="cn.zhuojingxinxi.web.ConvertAction">
	          <result name="success">/success.jsp</result>
	          <result name="input">/error.jsp</result>
	        </action>

2.4、action中的代码如下：

package cn.zhuojingxinxi.web;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import org.apache.struts2.ServletActionContext;

import cn.zhuojingxinxi.entity.Point;

import com.opensymphony.xwork2.ActionSupport;

public class ConvertAction extends ActionSupport{

	private Point point=null;



	public Point getPoint() {
		return point;
	}


	public void setPoint(Point point) {
		this.point = point;
	}


	public String execute(){

		System.out.println(point.getPointX()+"==========="+point.getPointY());
		return "success";

	}

}

值得注意的是：

1、文件上传的时候配置 <param name="allowedTypes">text/plain,image/jpeg,image/bmp</param>可以选择默认允许上传的文件类型。
2、错误页面必须配置 <s:fielderror></s:fielderror>才能显示错误信息

源码下载请点这里：