Struts2的文件上传和下载-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_15315/article/details/81887148

[color=darkred][b]1.文件上传[/b][/color]
[color=red] upload.jsp[/color]


<body>
  	<span style="color:red"><s:property value="#request.typeError"/></span>
  	<span style="color:red"><s:property value="#request.sizeError"/></span>
  	<span style="color:red"><s:fielderror/></span>
  	<form action="upload.action" method="post" enctype="multipart/form-data">
  		文件标题：<input type="text" name="title"/><br/>
  		选择文件：<input type="file" name="upload"/><br/>
  		<input type="submit" value="上传"/>
  	</form>
  </body>

[color=red] UploadAction.java[/color]


package com.cs.struts2.helloworld;

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

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {

	private String title;
	private File upload;
	private String uploadContentType;
	private String uploadFileName;
	private String savePath;
	private String allowTypes;
	private int fileSize;
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public File getUpload() {
		return upload;
	}
	public void setUpload(File upload) {
		this.upload = upload;
	}
	public String getUploadContentType() {
		return uploadContentType;
	}
	public void setUploadContentType(String uploadContentType) {
		this.uploadContentType = uploadContentType;
	}
	public String getUploadFileName() {
		return uploadFileName;
	}
	public void setUploadFileName(String uploadFileName) {
		this.uploadFileName = uploadFileName;
	}
	public String getSavePath() {
		return ServletActionContext.getRequest().getRealPath(savePath);
	}
	public void setSavePath(String savePath) {
		this.savePath = savePath;
	}

	@Override
	public String execute() throws Exception {
		System.out.println(this.getUploadContentType());
/*			
		//验证类型
		String filterResult = this.filterType(getAllowTypes().split(","));
		if(filterResult != null) {
			ActionContext.getContext().put("typeError", "上传的文件类型错误");
			return filterResult;
		}

    	//验证大小
		String filterSizeResult = this.filterSize(this.getFileSize());
		if(filterSizeResult != null) {
			ActionContext.getContext().put("sizeError", "上传的文件大小错误");
			return filterSizeResult;
		}
*/		
		FileOutputStream fos = new FileOutputStream(this.getSavePath()
+"\\"+this.getUploadFileName());
		FileInputStream fis = new FileInputStream(this.getUpload());
		byte[] buffer = new byte[1024];
		int len = 0;
		while((len=fis.read(buffer))>0) {
			fos.write(buffer,0,len);
		}
		return SUCCESS;
	}
/*
	public String getAllowTypes() {
		return allowTypes;
	}
	public void setAllowTypes(String allowTypes) {
		this.allowTypes = allowTypes;
	}
	//过滤类型
	public String filterType(String[] types) {
		String fileType = this.getUploadContentType();
		for(String type:types) {
			if(fileType.equals(type)) {
				return null;
			}
		}
		return INPUT;
	}
	public int getFileSize() {
		return fileSize;
	}

	public void setFileSize(int fileSize) {
		this.fileSize = fileSize;
	}

	//过滤大小（1M=1024*1024）
	public String filterSize(int fileSize) {
		if(this.getUpload().length()<= fileSize) {
			return null;
		}
		return INPUT;
	}
*/
}

[color=red] struts.xml[/color]


<action name="upload" class="com.cs.struts2.helloworld.UploadAction">
    		<param name="savePath">/upload</param>
    		<!-- 
    		<param name="allowTypes">image/jpeg,image/bmp,image/gif,image/jpeg</param>
    		<param name="fileSize">71680</param>
    		 -->
    		 <interceptor-ref name="fileUpload">
    		 	<param name="allowedTypes">image/jpeg,image/bmp,image/gif,image/jpeg</param>
    		 	<param name="maximumSize">71680</param>
    		 </interceptor-ref>
    		 <interceptor-ref name="defaultStack"/>
    		<result>/succ.jsp</result>
    		<result name="input">upload.jsp</result>
    	</action>

[color=red] succ.jsp[/color]


 <body>
 	上传成功！
 	文件标题：<s:property value="title"/><br/>
 	文件为： <IMG src="<s:property value="'upload/'+uploadFileName"/>"/><br/>
  </body>

[color=blue][b]
2.文件下载[/b][/color]
[color=red] download.jsp[/color]


<body>
    <a href="download.action">下载</a>
  </body>

[color=red] DownloadAction.java[/color]


package com.cs.struts2.helloworld;

import java.io.InputStream;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class DownloadAction extends ActionSupport {

	private String inputPath;

	public void setInputPath(String inputPath) {
		this.inputPath = inputPath;
	}

	public InputStream getTargetFile() throws Exception{
		return ServletActionContext.getServletContext()
		                .getResourceAsStream(inputPath);
	}

	@Override
	public String execute() throws Exception {
		ActionContext act = ActionContext.getContext();
		String user = (String)act.getSession().get("user");
		if(user!=null&&user.equals("cs")) {
			return SUCCESS;
		}
		act.put("tip", "您还没有登陆，请登录后再操作！");
		return INPUT;
	}
}

[color=red] stuts.xml[/color]


<action name="download" class="com.cs.struts2.helloworld.DownloadAction">
    		<param name="inputPath">/upload/Sunset.jpg</param>
    		<result name="success" type="stream">
    			<param name="contentType">image/jpg</param>
    			<param name="inputName">targetFile</param>
    			<param name="contentDisposition">filename="cc.jpg"</param>
    			<param name="bufferSize">102400</param>
    		</result>
    		<result name="input">login.jsp</result>
    	</action>