使用Swizzle Stream替換流中的字符串

Question

我試過Swizzle Stream庫來替換輸入流中的令牌。

String RESOURCE_PATH = "FakePom.xml"; 
    InputStream pomIS = JarFinderServlet.class.getClassLoader().getResourceAsStream(RESOURCE_PATH); 

    if(null == pomIS) 
    throw new MavenhoeException("Can't read fake pom template - getResourceAsStream(RESOURCE_PATH) == null"); 

    Map map = ArrayUtils.toMap( new String[][]{ 
    {"@GRP@", artifactInfo.getGroup() }, 
    {"@ART@", artifactInfo.getName() }, 
    {"@VER@", artifactInfo.getVersion() }, 
    {"@PACK@", artifactInfo.getPackaging() }, 
    {"@NAME@", artifactInfo.getFileName() }, 
    {"@DESC@", req.getQueryString() }, 
    }); 


    // This does not replace anything, no idea why. // 
    ReplaceStringsInputStream replacingIS = new ReplaceStringsInputStream(pomIS, map); 
    ReplaceStringInputStream replacingIS2 = new ReplaceStringInputStream(pomIS, "@VER@", "0.0-AAAAA"); 
    ReplaceStringInputStream replacingIS3 = new ReplaceStringInputStream(pomIS, "@", "#"); 

    ServletOutputStream os = resp.getOutputStream(); 
    IOUtils.copy(replacingIS, os); 
    replacingIS.close(); 

這沒有奏效。它只是不能取代。所以我訴諸於「PHP方式」...

String pomTemplate = IOUtils.toString(pomIS) 
    .replace("@GRP@", artifactInfo.getGroup()) 
    .replace("@ART@", artifactInfo.getName()) 
    .replace("@VER@", artifactInfo.getVersion()) 
    .replace("@PACK@", artifactInfo.getPackaging()) 
    .replace("@NAME@", artifactInfo.getFileName()) 
    .replace("@DESC@", req.getQueryString()); 

    ServletOutputStream os = resp.getOutputStream(); 
    IOUtils.copy(new StringInputStream(pomTemplate), os); 
    os.close(); 

作品。

怎麼了？

Answer 1

IOUtils.copy調用read（byte []）方法而不是read（），該方法被FixedTokenReplacementInputStream（ReplaceStringInputStream的超類）覆蓋。 你應該實現你自己的拷貝，例如，如下：

try { 
int b; 
while ((b = pomIS.read()) != -1) { 
    os.write(b); 
}} finally { os.flush();os.close(); }