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Java：阿里巴巴Fastjson decodeUTF8返回：索引超出范围-1 from springmvc？(Java:Alibaba Fastjson decodeUTF8 return:Index out of range -1 from springmvc?)
Java：阿里巴巴Fastjson decodeUTF8返回：索引超出范围-1 from springmvc？(Java:Alibaba Fastjson decodeUTF8 return:Index out of range -1 from springmvc?)
@ wenshao我有一个网站使用springmvc来请求其他api界面。 我使用HttpHelper.doPost方法来请求。
public static String doPost(String url, String json,String... args) throws Exception { URL localURL = new URL(url); URLConnection connection = localURL.openConnection(); HttpURLConnection httpURLConnection = (HttpURLConnection) connection; String encoding = getEncoding(args); int connectTimeout = getConnectTimeout(args); int readTimeout = getReadTimeout(args); httpURLConnection.setDoOutput(true); httpURLConnection.setRequestMethod("POST"); httpURLConnection.setRequestProperty("Accept-Charset", encoding); httpURLConnection.setConnectTimeout(connectTimeout); httpURLConnection.setReadTimeout(readTimeout); httpURLConnection.setRequestProperty("Content-Type", "application/json"); httpURLConnection.setRequestProperty("Content-Length", String.valueOf(json.length())); OutputStream outputStream = null; OutputStreamWriter outputStreamWriter = null; InputStream inputStream = null; InputStreamReader inputStreamReader = null; BufferedReader reader = null; StringBuffer resultBuffer = new StringBuffer(); String tempLine; try { outputStream = httpURLConnection.getOutputStream(); outputStreamWriter = new OutputStreamWriter(outputStream); outputStreamWriter.write(json); outputStreamWriter.flush(); if (httpURLConnection.getResponseCode() >= 400) { inputStream = httpURLConnection.getErrorStream(); } else { inputStream = httpURLConnection.getInputStream(); } inputStreamReader = new InputStreamReader(inputStream, encoding); reader = new BufferedReader(inputStreamReader); while ((tempLine = reader.readLine()) != null) { resultBuffer.append(tempLine); } } finally { close(outputStreamWriter, outputStream, reader, inputStreamReader, inputStream); } return String.valueOf(resultBuffer); }如果我使用单元测试来使用上面的代码来请求api，它会正常工作。但是，当我使用springmvc动作来请求它时，它给了我服务器错误500：索引超出了api接口的范围-1。下面的代码总是返回-1时，我使用springmvc来请求它。
public static int decodeUTF8(byte[] sa, int sp, int len, char[] da) { final int sl = sp + len; int dp = 0; int dlASCII = Math.min(len, da.length); // ASCII only optimized loop while (dp < dlASCII && sa[sp] >= 0) da[dp++] = (char) sa[sp++]; while (sp < sl) { int b1 = sa[sp++]; if (b1 >= 0) { // 1 byte, 7 bits: 0xxxxxxx da[dp++] = (char) b1; } else if ((b1 >> 5) == -2 && (b1 & 0x1e) != 0) { // 2 bytes, 11 bits: 110xxxxx 10xxxxxx if (sp < sl) { int b2 = sa[sp++]; if ((b2 & 0xc0) != 0x80) { // isNotContinuation(b2) return -1; } else { da[dp++] = (char) (((b1 << 6) ^ b2)^ (((byte) 0xC0 << 6) ^ ((byte) 0x80 << 0))); } continue; } return -1; } else if ((b1 >> 4) == -2) { // 3 bytes, 16 bits: 1110xxxx 10xxxxxx 10xxxxxx if (sp + 1 < sl) { int b2 = sa[sp++]; int b3 = sa[sp++]; if ((b1 == (byte) 0xe0 && (b2 & 0xe0) == 0x80) // || (b2 & 0xc0) != 0x80 // || (b3 & 0xc0) != 0x80) { // isMalformed3(b1, b2, b3) return -1; } else { char c = (char)((b1 << 12) ^ (b2 << 6) ^ (b3 ^ (((byte) 0xE0 << 12) ^ ((byte) 0x80 << 6) ^ ((byte) 0x80 << 0)))); boolean isSurrogate = c >= Character.MIN_SURROGATE && c < (Character.MAX_SURROGATE + 1); if (isSurrogate) { return -1; } else { da[dp++] = c; } } continue; } return -1; } else if ((b1 >> 3) == -2) { // 4 bytes, 21 bits: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx if (sp + 2 < sl) { int b2 = sa[sp++]; int b3 = sa[sp++]; int b4 = sa[sp++]; int uc = ((b1 << 18) ^ (b2 << 12) ^ (b3 << 6) ^ (b4 ^ (((byte) 0xF0 << 18) ^ ((byte) 0x80 << 12) ^ ((byte) 0x80 << 6) ^ ((byte) 0x80 << 0)))); if (((b2 & 0xc0) != 0x80 || (b3 & 0xc0) != 0x80 || (b4 & 0xc0) != 0x80) // isMalformed4 || // shortest form check !Character.isSupplementaryCodePoint(uc)) { return -1; } else { da[dp++] = (char) ((uc >>> 10) + (Character.MIN_HIGH_SURROGATE - (Character.MIN_SUPPLEMENTARY_CODE_POINT >>> 10))); // Character.highSurrogate(uc); da[dp++] = (char) ((uc & 0x3ff) + Character.MIN_LOW_SURROGATE); // Character.lowSurrogate(uc); } continue; } return -1; } else { return -1; } } return dp; }正常将返回我的请求json的实际长度，但春天不会。
编辑：我找到了错误发生的原因。因为我在请求中通过了中文json.how我可以解决吗？
@wenshao I have a website using springmvc to request other api interface. I using the HttpHelper.doPost method to request.
public static String doPost(String url, String json,String... args) throws Exception { URL localURL = new URL(url); URLConnection connection = localURL.openConnection(); HttpURLConnection httpURLConnection = (HttpURLConnection) connection; String encoding = getEncoding(args); int connectTimeout = getConnectTimeout(args); int readTimeout = getReadTimeout(args); httpURLConnection.setDoOutput(true); httpURLConnection.setRequestMethod("POST"); httpURLConnection.setRequestProperty("Accept-Charset", encoding); httpURLConnection.setConnectTimeout(connectTimeout); httpURLConnection.setReadTimeout(readTimeout); httpURLConnection.setRequestProperty("Content-Type", "application/json"); httpURLConnection.setRequestProperty("Content-Length", String.valueOf(json.length())); OutputStream outputStream = null; OutputStreamWriter outputStreamWriter = null; InputStream inputStream = null; InputStreamReader inputStreamReader = null; BufferedReader reader = null; StringBuffer resultBuffer = new StringBuffer(); String tempLine; try { outputStream = httpURLConnection.getOutputStream(); outputStreamWriter = new OutputStreamWriter(outputStream); outputStreamWriter.write(json); outputStreamWriter.flush(); if (httpURLConnection.getResponseCode() >= 400) { inputStream = httpURLConnection.getErrorStream(); } else { inputStream = httpURLConnection.getInputStream(); } inputStreamReader = new InputStreamReader(inputStream, encoding); reader = new BufferedReader(inputStreamReader); while ((tempLine = reader.readLine()) != null) { resultBuffer.append(tempLine); } } finally { close(outputStreamWriter, outputStream, reader, inputStreamReader, inputStream); } return String.valueOf(resultBuffer); }it works fine if I use unit test to request api using the code above.But when I use springmvc action to request it ,it give me the server error 500:index out of range -1 from the api interface.the below code always return -1 when I use springmvc to request it.
public static int decodeUTF8(byte[] sa, int sp, int len, char[] da) { final int sl = sp + len; int dp = 0; int dlASCII = Math.min(len, da.length); // ASCII only optimized loop while (dp < dlASCII && sa[sp] >= 0) da[dp++] = (char) sa[sp++]; while (sp < sl) { int b1 = sa[sp++]; if (b1 >= 0) { // 1 byte, 7 bits: 0xxxxxxx da[dp++] = (char) b1; } else if ((b1 >> 5) == -2 && (b1 & 0x1e) != 0) { // 2 bytes, 11 bits: 110xxxxx 10xxxxxx if (sp < sl) { int b2 = sa[sp++]; if ((b2 & 0xc0) != 0x80) { // isNotContinuation(b2) return -1; } else { da[dp++] = (char) (((b1 << 6) ^ b2)^ (((byte) 0xC0 << 6) ^ ((byte) 0x80 << 0))); } continue; } return -1; } else if ((b1 >> 4) == -2) { // 3 bytes, 16 bits: 1110xxxx 10xxxxxx 10xxxxxx if (sp + 1 < sl) { int b2 = sa[sp++]; int b3 = sa[sp++]; if ((b1 == (byte) 0xe0 && (b2 & 0xe0) == 0x80) // || (b2 & 0xc0) != 0x80 // || (b3 & 0xc0) != 0x80) { // isMalformed3(b1, b2, b3) return -1; } else { char c = (char)((b1 << 12) ^ (b2 << 6) ^ (b3 ^ (((byte) 0xE0 << 12) ^ ((byte) 0x80 << 6) ^ ((byte) 0x80 << 0)))); boolean isSurrogate = c >= Character.MIN_SURROGATE && c < (Character.MAX_SURROGATE + 1); if (isSurrogate) { return -1; } else { da[dp++] = c; } } continue; } return -1; } else if ((b1 >> 3) == -2) { // 4 bytes, 21 bits: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx if (sp + 2 < sl) { int b2 = sa[sp++]; int b3 = sa[sp++]; int b4 = sa[sp++]; int uc = ((b1 << 18) ^ (b2 << 12) ^ (b3 << 6) ^ (b4 ^ (((byte) 0xF0 << 18) ^ ((byte) 0x80 << 12) ^ ((byte) 0x80 << 6) ^ ((byte) 0x80 << 0)))); if (((b2 & 0xc0) != 0x80 || (b3 & 0xc0) != 0x80 || (b4 & 0xc0) != 0x80) // isMalformed4 || // shortest form check !Character.isSupplementaryCodePoint(uc)) { return -1; } else { da[dp++] = (char) ((uc >>> 10) + (Character.MIN_HIGH_SURROGATE - (Character.MIN_SUPPLEMENTARY_CODE_POINT >>> 10))); // Character.highSurrogate(uc); da[dp++] = (char) ((uc & 0x3ff) + Character.MIN_LOW_SURROGATE); // Character.lowSurrogate(uc); } continue; } return -1; } else { return -1; } } return dp; }the normal will return the actual length of my request json but the spring will not.
Edit: I found the reason why the error occurred.Because I passed the Chinese in request json.how can i solve it?
原文：https://stackoverflow.com/questions/45657936
更新时间：2023-11-07 06:11
最满意答案
- 找到一个HTML解析器库（libxml2可以完成这项工作）并阅读它的手册。 XPath可能会成为你的朋友。
- 找到一个HTTP客户端库（并阅读其手册），然后查看1。
- Find an HTML parser library (libxml2 might do the job) and read its manual. XPath will probably be your friend for this.
- Find an HTTP client library (and read its manual), then see 1.
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