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先上代碼

        String imgURL = "http://www.g3zj.net:8082/util.action?method=appauthimg&d_=99";

        byte[] data = null;
        try {
            // 創(chuàng)建URL
            URL url = new URL(imgURL);
            // 創(chuàng)建鏈接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(5 * 1000);
            InputStream inStream = conn.getInputStream();
            data = new byte[inStream.available()];
            inStream.read(data);
            inStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        // 對字節(jié)數(shù)組Base64編碼
        BASE64Encoder encoder = new BASE64Encoder();
        str=encoder.encode(data);

就是從一個網(wǎng)絡(luò)讀取圖片并轉(zhuǎn)成base64.發(fā)現(xiàn)轉(zhuǎn)出來的結(jié)果無法用于img標簽顯示（已加了data:image/jpeg;base64,前綴）。
后來直接百度找了一個在線生成base64的網(wǎng)站，把這個圖片url放上去轉(zhuǎn)換，
結(jié)果發(fā)現(xiàn)別人在線轉(zhuǎn)換出來的base64比我java代碼轉(zhuǎn)換的base64還長了很多。

為什么會這樣呢？

String imgURL = "http://www.g3zj.net:8082/util.action?method=appauthimg&d_=99"; ByteArrayOutputStream data = new ByteArrayOutputStream(); try { // 創(chuàng)建URL URL url = new URL(imgURL); byte[] by = new byte[1024]; // 創(chuàng)建鏈接 HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); conn.setConnectTimeout(5 * 1000); InputStream is = conn.getInputStream(); // 將內(nèi)容讀取內(nèi)存中 int len = -1; while ((len = is.read(by)) != -1) { data.write(by, 0, len); } // 關(guān)閉流 is.close(); } catch (IOException e) { e.printStackTrace(); } // 對字節(jié)數(shù)組Base64編碼 BASE64Encoder encoder = new BASE64Encoder(); System.out.println("data:image/jpg;base64,"+encoder.encode(data.toByteArray()));