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在logcat中打后台打印json数据时，json数据太过于长就会有打印不全的问题，这里记录一个办法就是分段打印：
// 采用分段打印 四千字符分一段
if (response.length() > 4000) {
for (int i = 0; i < response.length(); i += 4000) {
if (i + 4000 < response.length()) {
Log.i(第 + i + 数据, response.substring(i
