Struts2文件的上传-白红宇

一、单文件的上传

表单的enctype属性：

application/x-www-form-urlencoded:默认的编码方式。

multipart/form-data:会以二进制的方式处理表单数据，会将文件域指定文件的内容也封装到请求参数里。

text/plain:当action属性是的形式方便。

常用的上传框架是Common-FileUpload和COS，默认是Common-FileUpload，一旦框架获得了文件域对应的文件内容，我们就可以通过IO流将文件内容写入服务器的任意位置，从而完成文件上传。

可以通过struts.properties配置文件中，修改默认值：struts.multipart.parser=jakarta

1、处理上传文件的jsp页面

upload.jsp

1: <%@ page language="java" contentType="text/html; charset=UTF-8"

2:     pageEncoding="UTF-8"%>

3: <%@ page import="java.util.*" %>

4: <%@ taglib prefix="s" uri="/struts-tags" %>

5:

6:

7: <%

8: String path = request.getContextPath();

9: String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

10: %>

11:

12:

13:

14:     Struts2文件上传

15:

16:

17:       Struts 2完成上传

18:

19:

20:

21:

22:                 用户名:

23:

24:

25:

26:                 上传文件:

27:

28:

29:

30:

31:

32:

33:

34:

35:

36:

37:

2、UploadAction.java

1: package cc.openhome;

2: import java.io.File;

3: import java.io.FileInputStream;

4: import java.io.FileOutputStream;

5: import java.io.InputStream;

6: import java.io.OutputStream;

7: import org.apache.struts2.ServletActionContext;

8: import com.opensymphony.xwork2.ActionSupport;

9: public class UploadAction extends ActionSupport {

10:   // username属性用来封装用户名

11:   private String username;

12:

13:   // myFile属性用来封装上传的文件

14:   private File myFile;

15:

16:   // myFileContentType属性用来封装上传文件的类型

17:   private String myFileContentType;

18:

19:   // myFileFileName属性用来封装上传文件的文件名

20:   private String myFileFileName;

21:

22:

23:   //获得username值

24:   public String getUsername() {

25:     return username;

26:   }

27:

28:   //设置username值

29:   public void setUsername(String username) {

30:     this.username = username;

31:   }

32:

33:   //获得myFile值

34:   public File getMyFile() {

35:     return myFile;

36:   }

37:

38:   //设置myFile值

39:   public void setMyFile(File myFile) {

40:     this.myFile = myFile;

41:   }

42:

43:   //获得myFileContentType值

44:   public String getMyFileContentType() {

45:     return myFileContentType;

46:   }

47:

48:   //设置myFileContentType值

49:   public void setMyFileContentType(String myFileContentType) {

50:     this.myFileContentType = myFileContentType;

51:   }

52:

53:   //获得myFileFileName值

54:   public String getMyFileFileName() {

55:     return myFileFileName;

56:   }

57:

58:   //设置myFileFileName值

59:   public void setMyFileFileName(String myFileFileName) {

60:     this.myFileFileName = myFileFileName;

61:   }

62:

63:   public String execute() throws Exception {

64:

65:     //基于myFile创建一个文件输入流

66:     InputStream is = new FileInputStream(myFile);

67:

68:     // 设置上传文件目录

69:     String uploadPath = ServletActionContext.getServletContext()

70:         .getRealPath("/upload");

71:

72:     // 设置目标文件

73:     File toFile = new File(uploadPath, this.getMyFileFileName());

74:

75:     // 创建一个输出流

76:     OutputStream os = new FileOutputStream(toFile);

77:

78:     //设置缓存

79:     byte[] buffer = new byte[1024*1024];

80:

81:     int length = 0;

82:

83:     //读取myFile文件输出到toFile文件中

84:     while ((length = is.read(buffer)) > 0) {

85:       os.write(buffer, 0, length);

86:     }

87:     //关闭输入流

88:     is.close();

89:     //关闭输出流

90:     os.close();

91:     return SUCCESS;

92:   }

93: }

94:

95:

3、配置struts.xml

1:

2:

3:   "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

4:   "http://struts.apache.org/dtds/struts-2.3.dtd">

5:

6:

7:

8:

9:

10:

11:         image/bmp,image/png,image/gif,image/jpeg

12:         2000

13:

14:

15:       
    
     /WEB-INF/page/succ.jsp

16:       
    
     /upload.jsp

17:

18:

19:

20:

21:

4、succ.jsp

1: <%@ page language="java" contentType="text/html; charset=UTF-8"

2:     pageEncoding="UTF-8"%>

3: <%@ taglib prefix="s" uri="/struts-tags" %>

4:

5:

6:

7:

8:     Insert title here

9:

10:

11:     上传成功！

12:     上传用户：${username}

13:     文件标题：${ myFileFileName }

14:     文件类型：${ myFileContentType }

15:     文件为：
"/>

16:

17:

5、运行结果

此时，上传文件必须满足：大小小于2000kb，而且是图片文件。

二、多文件的上传

1、uploadmany.jsp

1: <%@ page language="java" contentType="text/html; charset=UTF-8"

2:     pageEncoding="UTF-8"%>

3:

4:

5:

6:

7:   数组多文件上传

8:

9:

10:

11:     上传用户：

12:     选择第一个文件：

13:     选择第二个文件：

14:     选择第三个文件：

15:

16:

17:

18:

19:

2、UploadAction.jsp

1: package cc.openhome;

2:

3: import java.io.File;

4: import java.io.FileInputStream;

5: import java.io.FileOutputStream;

6: import java.io.InputStream;

7: import java.io.OutputStream;

8: import java.util.List;

9: import org.apache.struts2.ServletActionContext;

10: import com.opensymphony.xwork2.ActionSupport;

11: public class UploadAction extends ActionSupport {

12:   // username属性用来封装用户名

13:   private String username;

14:

15:   // myFile属性用来封装上传的文件

16:   //private File[] myFile;

17:   private List
    
      myFile;

18:

19:   // myFileContentType属性用来封装上传文件的类型

20:   private List
    
      myFileContentType;

21:

22:   // myFileFileName属性用来封装上传文件的文件名

23:   private List
    
      myFileFileName;

24:

25:   //定义所有Action允许上传的类型

26:   private String allowTypes;

27:

28:   public String getAllowTypes() {

29:     return allowTypes;

30:   }

31:

32:   public void setAllowTypes(String allowTypes) {

33:     this.allowTypes = allowTypes;

34:   }

35:

36:   //获得username值

37:   public String getUsername() {

38:     return username;

39:   }

40:

41:   //设置username值

42:   public void setUsername(String username) {

43:     this.username = username;

44:   }

45:

46:   //获得myFile值

47:   public List
    
      getMyFile() {

48:     return myFile;

49:   }

50:

51:   //设置myFile值

52:   public void setMyFile(List
    
      myFile) {

53:     this.myFile = myFile;

54:   }

55:

56:   //获得myFileContentType值

57:   public List
    
      getMyFileContentType() {

58:     return myFileContentType;

59:   }

60:

61:   //设置myFileContentType值

62:   public void setMyFileContentType(List
    
      myFileContentType) {

63:     this.myFileContentType = myFileContentType;

64:   }

65:

66:   //获得myFileFileName值

67:   public List
    
      getMyFileFileName() {

68:     return myFileFileName;

69:   }

70:

71:   //设置myFileFileName值

72:   public void setMyFileFileName(List
    
      myFileFileName) {

73:     this.myFileFileName = myFileFileName;

74:   }

75:   public String execute() throws Exception {

76:     List
    
      files=getMyFile();

77:     for(int i=0;i

78:       //基于myFile创建一个文件输入流

79:       InputStream is = new FileInputStream(files.get(i));

80:

81:       // 设置上传文件目录

82:       String uploadPath = ServletActionContext.getServletContext()

83:           .getRealPath("/upload");

84:       // 设置目标文件

85:       //File[] toFile = new File(uploadPath, this.getMyFileFileName());

86:       File toFile = new File(uploadPath, this.getMyFileFileName().get(i));

87:       // 创建一个输出流

88:       OutputStream os = new FileOutputStream(toFile);

89:

90:       //设置缓存

91:       byte[] buffer = new byte[1024*1024];

92:

93:       int length = 0;

94:

95:       //读取myFile文件输出到toFile文件中

96:       while ((length = is.read(buffer)) > 0) {

97:         os.write(buffer, 0, length);

98:       }

99:       //关闭输入流

100:       is.close();

101:

102:       //关闭输出流

103:       os.close();

104:     }

105:     return SUCCESS;

106:   }

107: }

108:

109:

110:

3、struts.xml

1:

2:

3:   "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

4:   "http://struts.apache.org/dtds/struts-2.3.dtd">

5:

6:

7:

8:

9:

10:

11:         image/bmp,image/png,image/gif,image/jpeg

12:         20000000

13:

14:

15:             
    
     /succ.jsp

16:             
    
     /upload.jsp

17:

18:

19:

4、succ.jsp

1: <%@ page language="java" contentType="text/html; charset=UTF-8"

2:     pageEncoding="UTF-8"%>

3: <%@ taglib prefix="s" uri="/struts-tags" %>

4:

5:

6:

7:

8:     图片显示

9:

10:

11:     上传成功！

12:     上传用户:${ username }

13:     第一个文件名:${ myFileFileName[0] }

14:     第一个文件类型:${ myFileContentType[0] }

15:     第一个文件为：
"/>

16:     第二个文件名:${ myFileFileName[1] }

17:     第二个文件类型:${ myFileContentType[1] }

18:     第二个文件为：
"/>

19:     第三个文件名:${ myFileFileName[2] }

20:     第三个文件类型:${ myFileContentType[2] }

21:     第三个文件为：
"/>

22:

23:

5、运行结果

当神已无能为力，那便是魔渡众生