struts 文件上传与下载-优快云博客

本文详细介绍了如何使用Struts2框架进行文件上传和下载的功能实现。通过配置struts.xml文件，设置文件大小和类型限制，展示了上传过程中的表单创建、拦截器配置以及上传类的编写。同时，提供了下载功能的实现方法。

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设置文件大小和类型

在struts.xml文件里配置

<interceptor-ref name="defaultStack">

<param name="fileUpload.maximumSize">4194304</param> 4M

<param name="fileUoliad.allowedExtensions">.txt,.doc,.jsp</param>

<param name="fileUpload.allowedTypes">text/plain,application/msword,image/jpeg</param>

</interceptor-ref>

上传

struts.xml

<action name="uploadfile" class="Upload">
	<result name="success">/filesuccess.jsp</result>
	</action>

jsp

<s:form action="uploadfile" method="post" enctype="multipart/form-data">
     <s:file name="file" label="头像"></s:file>
     <s:reset value="重置"></s:reset>
   	 <s:submit value="提交·"></s:submit>
     </s:form>

Upload类三个变量必不可少，而且大小写也不能错

set和get方法来读取

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.opensymphony.xwork2.ActionSupport;

public class Upload extends ActionSupport{
	private static final long seriaVersionUID=1L;
	private File file;
	private String fileFileName;
	private String fileContentType;
	public File getFile() {
		return file;
	}
	public void setFile(File file) {
		this.file = file;
	}
	public String getFileFileName() {
		return fileFileName;
	}
	public void setFileFileName(String fileFileName) {
		this.fileFileName = fileFileName;
	}
	public String getFileContentType() {
		return fileContentType;
	}
	public void setFileContentType(String fileContentType) {
		this.fileContentType = fileContentType;
	}
	
	public String execute() throws Exception{
		//文件输入流
		InputStream iStream = new BufferedInputStream(new FileInputStream(file));
		//设置文件保存目录
		String uploadPath = "D:\\Myeclipse\\新建文件夹\\SSH2.0\\WebRoot\\img";
		File file1 = new File(uploadPath);
        if (!file1.exists()) {
            file1.mkdir();
        }
		
        OutputStream OStream = new BufferedOutputStream(new FileOutputStream(uploadPath + "\\" + this.getFileFileName()));
        System.out.println(this.getFileFileName());
        try {
		//文件输入流
		
		byte[] buffer = new byte[1024];
		int length = 0;
		//读取file文件输出到File文件中
		while (( length= iStream.read(buffer)) > 0) {
            OStream.write(buffer, 0, length);
        }
        }catch (Exception e) {
            // 记录日志
        } finally {
            if (iStream != null) {
                try {
                    iStream.close();
                } catch (IOException e) {
                    // 记录日志
                }
            }
            if (OStream != null) {
                try {
                    OStream.close();
                } catch (IOException e) {
                    // 记录日志
                }
            }
        }

        
		
		return SUCCESS;
	}
}

最后写一个成功页面就行了