Home > Java > javaTutorial > Sharing methods for project security handling in Java

Sharing methods for project security handling in Java

黄舟
Release: 2017-09-19 10:40:33
Original
2120 people have browsed it

这篇文章主要介绍了Java项目安全处理方法,URL中参数显示,sql拼接问题,需要的朋友可以参考下

一、URL中参数显示问题,解决方案:

1、普通Get请求修改为Post请求

2、参数加密(js加密,Java解密)

二、Mybatis模糊查询中,sql拼接问题,解决方案方案:

1、使用安全的符号和方法,xml中拼接示例:


<if test="stateList != null">
  state in 
  <foreach close=")" collection="stateList" index="index" item="sta" open="(" separator=",">
    #{stateList[${index}]}
  </foreach>
</if>
<if test="title != null and title != &#39;&#39;">
    and title like concat(&#39;%&#39;,#{title},&#39;%&#39;) 
</if>
Copy after login

2、Java中转义特殊字符,Java中字符处理示例:


param = param.replace("%", "\\%");
param = param.replace("_", "\\_");
param = param.replace(",", "\\,");
param = param.replace("&#39;", "\\&#39;");
param = param.replace("/", "//");
param = param.replace("\\", \\\\);
Copy after login

三、文件上传安全问题

解决方案:判断文件名、请求ContentType和文件头内容。

文件头内容判断:

常见文件类型识别


常用文件的头信息: 
JPEG (jpg),文件头:FFD8FFE1 
PNG (png),文件头:89504E47 
GIF (gif),文件头:47494638
TIFF (tif),文件头:49492A00 
Windows Bitmap (bmp),文件头:424D 
CAD (dwg),文件头:41433130
Adobe Photoshop (psd),文件头:38425053
Rich Text Format (rtf),文件头:7B5C727466 
XML (xml),文件头:3C3F786D6C 
HTML (html),文件头:68746D6C3E 
Email [thorough only] (eml),文件头:44656C69766572792D646174653A 
Outlook Express (dbx),文件头:CFAD12FEC5FD746F 
Outlook (pst),文件头:2142444E 
MS Word/Excel (xls.or.doc),文件头:D0CF11E0 
MS Access (mdb),文件头:5374616E64617264204A 
WordPerfect (wpd),文件头:FF575043 
Postscript (eps.or.ps),文件头:252150532D41646F6265 
Adobe Acrobat (pdf),文件头:255044462D312E 
Quicken (qdf),文件头:AC9EBD8F 
Windows Password (pwl),文件头:E3828596 
ZIP Archive (zip),文件头:504B0304 
RAR Archive (rar),文件头:52617221
Wave (wav),文件头:57415645
AVI (avi),文件头:41564920
Real Audio (ram),文件头:2E7261FD 
Real Media (rm),文件头:2E524D46 
MPEG (mpg),文件头:000001BA 
MPEG (mpg),文件头:000001B3 
Quicktime (mov),文件头:6D6F6F76 
Windows Media (asf),文件头:3026B2758E66CF11 
MIDI (mid),文件头:4D546864
Copy after login

java附件上传时后台验证上传文件的合法性


public static Map<string, string=""> mFileTypes = new HashMap<string, string="">();
static {
    // imagesFFD8FFE1
    mFileTypes.put("FFD8FFE1", ".jpg");
    mFileTypes.put("FFD8FFE0", ".jpg");
    mFileTypes.put("89504E47", ".png");
    mFileTypes.put("47494638", ".gif");
    mFileTypes.put("49492A00", ".tif");
    mFileTypes.put("424D", ".bmp");
    // 办公文档类
    mFileTypes.put("D0CF11E0", ".doc"); // ppt、doc、xls
    mFileTypes.put("504B0304", ".docx"); // pptx、docx、xlsx
    /** 注意由于文本文档录入内容过多,则读取文件头时较为多变-START **/
    mFileTypes.put("0D0A0D0A", ".txt"); // txt
    mFileTypes.put("0D0A2D2D", ".txt"); // txt
    mFileTypes.put("0D0AB4B4", ".txt"); // txt
    mFileTypes.put("B4B4BDA8", ".txt"); // 文件头部为汉字
    mFileTypes.put("73646673", ".txt"); // txt,文件头部为英文字母
    mFileTypes.put("32323232", ".txt"); // txt,文件头部内容为数字
    mFileTypes.put("0D0A09B4", ".txt"); // txt,文件头部内容为数字
    mFileTypes.put("3132330D", ".txt"); // txt,文件头部内容为数字
    /** 注意由于文本文档录入内容过多,则读取文件头时较为多变-END **/
    mFileTypes.put("25504446", ".pdf");
    mFileTypes.put("255044462D312E", ".pdf");
    // 压缩包
    mFileTypes.put("52617221", ".rar");
    mFileTypes.put("1F8B08", ".gz");
}
/**
    * 判断上传的文件是否合法
    * 
    * @param file
    *            文件
    * @param contentType
    *            是否指定类型
    * @param typeStr
    *            文件类型后缀名(.jpg,.png,.gif,.jpeg)
    * @return
    */
public Boolean checkFileIllegal(MultipartFile file, String fileName, String typeStr) {
    if (!file.isEmpty()) {
        if (StringUtils.isNotBlank(file.getContentType())) {
            String type = null;
            try {
                type = getFileType(file.getInputStream());
            } catch (IOException e) {
            logger.error("checkFileIllegal->getFileType->error:" + e.getMessage());
            return false;
        }
        if (null != type && -1 != typeStr.indexOf(type)) {
            int index = fileName.lastIndexOf(".");
            if (StringUtils.isNotBlank(fileName) && -1 != index) {
                String fileType = fileName.substring(index).toLowerCase();
                if (-1 != typeStr.indexOf(fileType)) {
                    return true;
                    }
                }
            }
        }
    }
    return false;
}
/**
 * 根据文件的输入流获取文件头信息
 * @return 文件头信息
 */
public static String getFileType(InputStream is) {
    byte[] b = new byte[4];
    if (is != null) {
        try {
            is.read(b, 0, b.length);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    return mFileTypes.get(getFileHeader(b));
}
Copy after login

总结

The above is the detailed content of Sharing methods for project security handling in Java. For more information, please follow other related articles on the PHP Chinese website!

Related labels:
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template