JVM 學習 第 2 課

go  程式碼從壓縮檔案中查詢引數中輸入的檔案，如從

C:\Program Files\Java\jdk1.8.0_65\jre\lib\rt.jar 中找到java/lang/Object.class，並讀取java/lang/Object.class的資料。 

func (self *ZipEntry) readClass(className string) ([]byte, Entry, error) {
r, err := zip.OpenReader(self.absPath)
if err != nil {
return nil, nil, err
}


defer r.Close()
for _, f := range r.File {




if f.Name == className {

fmt.Printf("imf zipfile ReadClass %v\n    ", className)
fmt.Printf("imf  zip OpenReader self absPath  %v\n    ",  self.absPath )
fmt.Printf("   \n  " )
 fmt.Printf("  \n  " )
rc, err := f.Open()
if err != nil {
return nil, nil, err
}


defer rc.Close()
data, err := ioutil.ReadAll(rc)
if err != nil {
return nil, nil, err
}


return data, self, nil
}
}


return nil, nil, errors.New("class not found: " + className)
}