进行文件上传老师出现错误
The server encountered an internal error () that prevented it from fulfilling this request.
java.lang.NullPointerException
cn.wshd.action.Test_upload.execute(Test_upload.java:59)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
代码
package cn.wshd.action;
import java.io.*;
import com.opensymphony.xwork2.ActionContext;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class Test_upload extends ActionSupport {
private String title;
private File upload;
private String uploadContentType;
private String uploadFileName;
private String allowTypes;
// 接受依赖注入的属性
private String savePath;
// 接受依赖注入的方法
public void setSavePath(String savePath) {
this.savePath = savePath;
}
private String getSavePath() throws Exception {
return ServletActionContext.getServletContext().getRealPath(savePath);
}
public void setTitle(String title) {
this.title = title;
}
public void setUpload(File upload) {
this.upload = upload;
}
public void setUploadContentType(String uploadContentType) {
this.uploadContentType = uploadContentType;
}
public void setUploadFileName(String uploadFileName) {
this.uploadFileName = uploadFileName;
}
public String getTitle() {
return (this.title);
}
public File getUpload() {
return (this.upload);
}
public String getUploadContentType(){
return (this.uploadContentType);
}
public String getUploadFileName() {
return (this.uploadFileName);
}
@Override
public String execute() throws Exception {
System.out.println("开始上传单个文件---");
System.out.println(getSavePath());
System.out.println("==========" + getUploadFileName());
System.out.println("==========" + getUploadContentType());
System.out.println("==========" + getUpload());
// 判断是否允许上传
String filterResult = filterType(this.getAllowTypes().split(","));
if (filterResult != null) {
ActionContext.getContext().put("typeError","您要上传的文件类型不正确");
return filterResult;
}
// 以服务器的文件保存地址和原文件名建立上传文件输出流
FileOutputStream fos = new FileOutputStream(getSavePath() + "\"
+ getUploadFileName());
FileInputStream fis = new FileInputStream(getUpload());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
return SUCCESS;
}
public String filterType(String[] types) {
String fileType = this.getUploadContentType();
for (String type : types) {
if (type.equals(fileType)) {
return null;
}
}
return INPUT;
}
public String getAllowTypes() {
return allowTypes;
}
public void setAllowTypes(String allowTypes) {
this.allowTypes = allowTypes;
}
}
<package name="test_upload" extends="struts-default">
<action name="test_upload" class="cn.wshd.action.Test_upload" method="execute">
<param name="allowTypes">
image/pjpeg,image/bmp,image/jpg,image/png,image/gif,image/jpeg
</param>
<param name="savePath">
/upload
</param>
<result name="success">/success.jsp</result>
<result name="input">/test_upload.jsp</result>
</action>
</package>
