FileUtils文件上传.docx

一、单文件上传：1：struts.xml文件配置如下： view plaincopy to clipboardprint?01. 02. 05. 06. 07. 08. 10. 11. 12. 13. 14. 16. 17. 18. image/bmp,image/png,image/gif,image/jpeg,image/jpg 19. ,image/x-png, image/pjpeg 20. 21. 1048576 22. 23. 24. /upload 25. /resultUpload.jsp 26. 27. 28. 29. !- - 30. 31. image/bmp,image/png,image/gif,image/jpeg,image/jpg,image/x-png, image/pjpeg1048576/upload/resultUpload.jsp!- - 备注1：在action中添加/upload主要用来设定保存上传文件的路径，相对路径和绝对路径都可 备注2：上面那个拦截器可要可不要，因为限制上传文件大小和类型在拦截器里配置不能起作用，要用常量配置如下面的限制文件大小的 上面的常量覆盖了perties里的设置2：FileUploadAction代码如下： view plaincopy to clipboardprint?01.import java.io.BufferedInputStream; 02.import java.io.BufferedOutputStream; 03.import java.io.File; 04.import java.io.FileInputStream; 05.import java.io.FileNotFoundException; 06.import java.io.FileOutputStream; 07.import java.io.IOException; 08.import java.io.InputStream; 09.import java.io.OutputStream; 10. 11.import mons.io.FileUtils; 12.import org.apache.struts2.ServletActionContext; 13. 14. 15.public class FileUploadAction 16. 17. private final static int BUFFER_SIZE = 16 * 1024; 18. private File upload; 19. private String uploadFileName; 20. private String uploadContentType; 21. private String title; 22. private String SavePath; 23. private String ss; 24. 25. 26. public String getSavePath() 27. return SavePath; 28. 29. 30. public void setSavePath(String savePath) 31. SavePath = savePath; 32. 33. 34. public String getTitle() 35. return title; 36. 37. 38. public void setTitle(String title) 39. this.title = title; 40. 41. 42. public File getUpload() 43. return upload; 44. 45. 46. public void setUpload(File upload) 47. this.upload = upload; 48. 49. 50. public String getUploadContentType() 51. return uploadContentType; 52. 53. 54. public void setUploadContentType(String uploadContentType) 55. this.uploadContentType = uploadContentType; 56. 57. 58. public String getUploadFileName() 59. return uploadFileName; 60. 61. 62. public void setUploadFileName(String uploadFileName) 63. this.uploadFileName = uploadFileName; 64. 65. 66. 67. 68. /* 69. * copy这个方法主要是用来实现文件上传的，实现的原理就是分别打开输入输出流，进行文件拷贝的 70. */ 71. private void copy(File src, File dist) 72. InputStream in = null; 73. BufferedOutputStream out = null; 74. 75. try 76. in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE); 77. out = new BufferedOutputStream(new FileOutputStream(dist),BUFFER_SIZE); 78. byte buffer = new byteBUFFER_SIZE; 79. int len = 0; 80. try 81. while (len=in.read(buffer) 0) 82. out.write(buffer, 0, len); 83. 84. catch (IOException e) 85. e.printStackTrace(); 86. 87. catch (FileNotFoundException e) 88. e.printStackTrace(); 89. finally 90. if(null!=in) 91. try 92. in.close(); 93. catch (IOException e) 94. e.printStackTrace(); 95. 96. 97. if(null!=out) 98. try 99. out.close(); 100. catch (IOException e) 101. e.printStackTrace(); 102. 103. 104. 105. 106. 107. 108. public String upload() 109. String distPath = ServletActionContext.getServletContext().getRealPath(getSavePath()+getUploadFileName(); 110. System.out.println(distPath); 111. File disFile = new File(distPath); 112. System.out.println(文件类型: +getUploadContentType(); 113./ try 114./ FileUtils.copyFile(upload, disFile); 115./ catch (IOException e) 116./ e.printStackTrace(); 117./ 118. copy(upload,disFile); 119. return success; 120. 121. 122. import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import mons.io.FileUtils;import org.apache.struts2.ServletActionContext;public class FileUploadAction private final static int BUFFER_SIZE = 16 * 1024;private File upload;private String uploadFileName;private String uploadContentType;private String title;private String SavePath;private String ss;public String getSavePath() return SavePath;public void setSavePath(String savePath) SavePath = savePath;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; /* * copy这个方法主要是用来实现文件上传的，实现的原理就是分别打开输入输出流，进行文件拷贝的 */private void copy(File src, File dist) InputStream in = null;BufferedOutputStream out = null;try in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);out = new BufferedOutputStream(new FileOutputStream(dist),BUFFER_SIZE);byte buffer = new byteBUFFER_SIZE;int len = 0;try while (len=in.read(buffer) 0) out.write(buffer, 0, len); catch (IOException e) e.printStackTrace(); catch (FileNotFoundException e) e.printStackTrace();finallyif(null!=in)try in.close(); catch (IOException e) e.printStackTrace();if(null!=out)try out.close(); catch (IOException e) e.printStackTrace(); public String upload() String distPath = ServletActionContext.getServletContext().getRealPath(getSavePath()+getUploadFileName();System.out.println(distPath);File disFile = new File(distPath);System.out.println(文件类型: +getUploadContentType();/try /FileUtils.copyFile(upload, disFile);/ catch (IOException e) /e.printStackTrace();/copy(upload,disFile);return success; 备注： 1：ServletActionContext context = ServletActionContext.getServletContext(); 2: ServletActionContext.getServletContext().getRealPath(getSavePath() 得到上传文件目的文件夹的实际路径 3: ServletActionContext.getServletContext().getRealPath(getSavePath()+getUploadFileName() 一个文件的实际路径，这个主要是用来建立输出流 如 File disFile = new File(distPath) OutputStream out = new BufferedOutputStream(new FileOutputStream(dist),BUFFER_SIZE); 4: 上传文件可以自己用io流拷贝文件，还可以用FileUtils.copyFile(file1,file2); 5:File的名字要和上传页面File域name属性的值一致如：upload 则FileUploadAction中的File的名字也应为upload (private File upload)，除此之外还要添加以下两个属性： private String uploadFileName 对应于上传文件的名字 private String uploadContentType 对应于上传文件的类型 以上两个属性的名字的命名必需以File的属性名开头，然后再加上FileName或ContentType如 uploadFileName 和 uploadContentType3：jsp页面如下： view plaincopy to clipboardprint?01. 03. 04. 05. 06. 07.struts2单文件上传页面 08. 09. 10. 11.标题: 12.请选选择： 13. 14. 15. 16. struts2单文件上传页面标题:请选选择： 二、多文件上传1:多文件上传的struts.xml配置文件和单文件上传配置文件一样，这里就不再介绍了。2：MultUploadAction如下： view plaincopy to clipboardprint?01.import java.io.File; 02.import java.io.IOException; 03. 04.import mons.io.FileUtils; 05.import org.apache.struts2.ServletActionContext; 06. 07.import com.opensymphony.xwork2.ActionSupport; 08. 09.public class MultUploadAction extends ActionSupport 10. 11. private File upload; 12. private String uploadFileName; 13. private String uploadContentType; 14. private String savePath; 15. 16. 17. public String getSavePath() 18. return savePath; 19. 20. 21. public void setSavePath(String savePath) 22. this.savePath = savePath; 23. 24. 25. public File getUpload() 26. return upload; 27. 28. 29. public void setUpload(File upload) 30. this.upload = upload; 31. 32. 33. public String getUploadContentType() 34. return uploadContentType; 35. 36. 37. public void setUploadContentType(String uploadContentType) 38. this.uploadContentType = uploadContentType; 39. 40. 41. public String getUploadFileName() 42. return uploadFileName; 43. 44. 45. public void setUploadFileName(String uploadFileName) 46. this.uploadFileName = uploadFileName; 47. 48. 49. public String execute() 50. String realPath = ServletActionContext.getServletContext().getRealPath(savePath); 51. for(int i=0;iupload.length;i+) 52. File distFile = new File(realPath+uploadFileNamei); 53. try 54. FileUtils.copyFile(uploadi,distFile); 55. catch (IOException e) 56. e.printStackTrace(); 57. 58. 59. return SUCCESS; 60. 61. 62. import java.io.File;import java.io.IOException;import mons.io.FileUtils;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;public class MultUploadAction extends ActionSupport private File upload;private String uploadFileName;private String uploadContentType;private String savePath;public String getSavePath() return savePath;public void setSavePath(String savePath) this.savePath = savePath;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 execute()String realPath = ServletActionContext.getServletContext().getRealPath(savePath);for(int i=0;iupload.length;i+)File distFile = new File(realPath+uploadFileNamei);try FileUtils.copyFile(uploadi,distFile); catch (IOException e) e.printStackTrace();return SUCCESS; 备注1： 多文件上传的实质的单文件上传一样，只不过多文件上传时文件，文件名，文件类型会保存到数组里面如： private File upload; private String uploadFileName; private String uploadContentType; 有一点很重要，那就是uploadi 和 uploadFileNamei 和 uploadContentTypei 相对应，理解这一点就好办了，利用循环针到单文件操作了 备注2： 这里用了第二种方法上传文件FileUtils.copyFile(file1,file2),自己写io流copy也可以3:jsp页面如下： view plaincopy to clipboardprint?01. 03. 04. 05. 06. 07.Insert title here 08. 09. 10. 11.文件1 12.文件2 13.文件3 14.文件4 15. 16. 17. 18. Insert title here文件1文件2文件3文件4 总结：1.文件上传的原理： 表单元素的enctype属性指定的是表单数据的编码方式，该属性有3个值： 1) application/x-www-form-urlencoded：这是默认编码方式，它只处理表单域里的value属性值，采用这种编码方式的表单会将表单域的值处理成URL编码方式。 2) multipart/form-data：这种编码方式的表单会以二进制流的方式来处理表单数据，这种编码方式会把文件域指定文件的内容也封装到请求参数里。 3) text/plain：这种方式主要适用于直接通过表单发送邮件的方式。 文件上传是web应用经常用到的一个知识。原理是，通过为表单元素设置enctype=multipart/form-data属性，让表单提交的数据以二进制编码的方式提交。 在接收此请求的Servlet中用二进制流来获取内容，就可以取得上传文件的内容，从而实现文件的上传。 在Java领域中，有两个常用的文件上传项目：一个是Apache组织Jakarta的Common-FileUpload组件(/fileupload/); 另一个是Oreilly组织的COS框架(/cos/)。利用这两个