Struts2文件上传/图片(基于表单的文件/图片上传)

﹏ヽ暗。殇╰゛Y 2022-05-21 06:41 293阅读 0赞

注：如果代码中的配置有些看不懂的，可以去看我之前写的Struts2配置，其他的我都会做出解释

## 1、全局图片 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RvbXdpbGRib2Fy_size_16_color_FFFFFF_t_70][]

**2、struts.xml （主配置文件） **

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
    	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    	"http://struts.apache.org/dtds/struts-2.3.dtd">
    <struts>
    				
    	<constant name="struts.multipart.maxSize" value="100000000000"></constant>
    	<package name="struts-upload" namespace="/" extends="struts-default">
    		
    		<global-results>
    			<result name="error" type="redirect">/error.jsp</result>
    		</global-results>
    				
    		<action name="StrutsUploadAction" class="StrutsUploadAction" method="execute">
    						
    			<interceptor-ref name="defaultStack">
    				<param name="fileUpload.maximumSize">500000000</param>	
    			</interceptor-ref>	
    			<result name="success" type="redirect">/success.jsp</result>
    		</action>
    	</package>
    
    </struts>

**3、error.jsp （上传失败的jsp）**

**4、success.jsp  （上传成功的jsp）**

4、success.jsp  （上传成功的jsp）
    <%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<h1>上传成功</h1>
    </body>
    </html>

**5、upload.jsp （上传jsp，这里说一点：form的enctype值必须是multipart/form-data）**

<%@ page language="java" contentType="text/html; charset=UTF-8"
        pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    	<form action="${pageContext.request.contextPath }/StrutsUploadAction" method="post" enctype="multipart/form-data">
    		<input type="file" name="upload"> <br/>		
    		<input type="submit" value="上传">
    	</form>
    </body>
    </html>

6、StrutsUploadAction.java （这里先给出最基础的Action，最好是看到这里停下来，然后用上面的代码 + 这个Action就自己去写出上传的全部，如果是会简单的java上传文件，那么你就可以写出来了）

import java.io.File;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    public class StrutsUploadAction extends ActionSupport{
    
    	private File upload;				//得到上传的文件
    	private String uploadContentType;	//得到上传文件的类型
    	private String uploadFileName;		//得到上传文件的名称
    	
    	@Override
    	public String execute() throws Exception {
    
    		System.out.println("filename   :" + this.getUploadFileName());
    		System.out.println("uploadType    :" + this.getUploadContentType());
    		System.out.println("file" + this.getUpload());
    		
    		
    		
    		return SUCCESS;
    	}
    
    	//get / set  
    	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;
    	}
    	
    }

**7、如果看到这里你还是写不出完整的上传，也没有关系。下面我会把完整的Action给你，你可以参考的看看 （代码亲测有效）**

import java.io.File;
    import java.io.FileInputStream;
    import java.io.FileOutputStream;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.util.UUID;
    
    import org.apache.commons.io.IOUtils;
    import org.apache.struts2.ServletActionContext;
    
    import com.opensymphony.xwork2.ActionSupport;
    
    public class StrutsUploadAction extends ActionSupport{
    
    	private File upload;				//得到上传的文件
    	private String uploadFileName;		//得到上传文件的名称
    	
    	@Override
    	public String execute() throws Exception {
    
    		//这个upload的路径是相对于WebContent下的	
    		String path = ServletActionContext.getServletContext().getRealPath("/upload");	
    		//准备这个文件的文件名	
    		String filename = UUID.randomUUID().toString() + "." +this.getUploadFileName().substring(this.getUploadFileName().lastIndexOf(".")+1);
    				
    		OutputStream out = new FileOutputStream(path + "/" + filename);
    		InputStream in = new FileInputStream(upload);
    		IOUtils.copy(in, out);
    		
    		in.close();
    		out.close();
    		
    		
    		return SUCCESS;
    	}
    
    	//get / set  
    	public File getUpload() {
    		return upload;
    	}
    
    	public void setUpload(File upload) {
    		this.upload = upload;
    	}
    
    	public String getUploadFileName() {
    		return uploadFileName;
    	}
    
    	public void setUploadFileName(String uploadFileName) {
    		this.uploadFileName = uploadFileName;
    	}
    	
    }

如果还有问题，可以给我留言或者联系我，我会尽可能的帮你解决的。

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1RvbXdpbGRib2Fy_size_16_color_FFFFFF_t_70]: /images/20220521/975e19718978464f8aeeeddc2f42e901.png