Gson TypeAdapter使用技巧几例：数据免判空、解析后校验、预处理.zip

package com.paincker.utils; import java.io.*; import java.lang.reflect.Array; import java.lang.reflect.Field; import java.util.*; /** * Created by jzj on 2017/11/22. */ public class StringUtils { private static final HashSet<Object> basicSet = new HashSet<>(); static { basicSet.add(Boolean.class); basicSet.add(Byte.class); basicSet.add(Character.class); basicSet.add(Short.class); basicSet.add(Integer.class); basicSet.add(Long.class); basicSet.add(Float.class); basicSet.add(Double.class); basicSet.add(String.class); basicSet.add(Object.class); } /** * 通过反射将对象格式化成字符串，主要用于Log输出 */ public static String objectDeepToString(Object o) { TabStringBuilder builder = new TabStringBuilder(); objectDeepToString(builder, o); return builder.toString(); } private static void objectDeepToString(TabStringBuilder builder, Object o) { if (o == null) { builder.append("null"); return; } if (builder.getTabCount() > 15) { // max depth builder.append(o); return; } final Class<?> clazz = o.getClass(); if (o instanceof String) { builder.append('"').append(o).append('"'); return; } if (clazz.isPrimitive() || basicSet.contains(clazz)) { builder.append(o); return; } if (clazz.isArray()) { builder.append('['); int length = Array.getLength(o); if (length > 0) { builder.incTab(); for (int i = 0; i < length; i++) { if (i > 0) { builder.append(','); } builder.newLine(); objectDeepToString(builder, Array.get(o, i)); } builder.decTab(); builder.newLine(); } builder.append(']'); return; } if (o instanceof Collection) { builder.append('['); Collection collection = (Collection) o; if (!collection.isEmpty()) { builder.incTab(); boolean first = true; for (Object item : collection) { if (first) { first = false; } else { builder.append(','); } builder.newLine(); objectDeepToString(builder, item); } builder.decTab(); builder.newLine(); } builder.append(']'); return; } if (o instanceof Map) { builder.append('{'); Map map = (Map) o; if (!((Map) o).isEmpty()) { builder.incTab(); boolean first = true; //noinspection unchecked for (Map.Entry entry : (Set<Map.Entry>) map.entrySet()) { if (first) { first = false; } else { builder.append(','); } builder.newLine().append(entry.getKey()).append(": "); objectDeepToString(builder, entry.getValue()); } builder.decTab(); builder.newLine(); } builder.append('}'); return; } builder.append('{'); ArrayList<Field> fields = getAllFields(clazz, true); if (!fields.isEmpty()) { builder.incTab(); boolean first = true; for (Field field : fields) { if (first) { first = false; } else { builder.append(','); } try { field.setAccessible(true); Object value = field.get(o); builder.newLine().append(field.getName()).append(": "); objectDeepToString(builder, value); } catch (IllegalAccessException e) { L.e(e); } } builder.decTab(); builder.newLine(); } builder.append('}'); } /** * 获取Class的所有Field，包括继承的 * * @param clazz Class * @param superClassFirst 继承自父类的Field放前面 */ public static ArrayList<Field> getAllFields(Class clazz, boolean superClassFirst) { ArrayList<Field> list = new ArrayList<>(); while (clazz != null && clazz != Object.class) { Field[] fields = clazz.getDeclaredFields(); if (fields != null && fields.length > 0) { if (superClassFirst) { list.addAll(0, Arrays.asList(fields)); } else { Collections.addAll(list, fields); } } clazz = clazz.getSuperclass(); } return list; } public static String readAsString(File file) { try { return readAsString(new FileInputStream(file), "utf-8"); } catch (FileNotFoundException e) { return null; } } public static String readAsString(InputStream stream) { return readAsString(stream, "utf-8"); } public static String readAsString(InputStream is, String encode) { if (is == null) { return null; } BufferedReader reader = null; try { reader = new BufferedReader(new InputStreamReader(is, encode)); StringBuilder sb = new StringBuilder(); String line; while ((line = reader.readLine()) != null) { sb.append(line).append("\n"); } return sb.toString(); } catch (IOException e) { L.e(e); } finally { if (reader != null) { try { reader.close(); } catch (IOException e) { L.e(e); } } } return null; } /** * 换行时带有缩进的StringBuilder */ public static class TabStringBuilder { private final StringBuilder mBuilder = new StringBuilder(); private final Tab mTab = new Tab(); /** * 获取当前缩进数量，初始值为0，可能为负数 */ public int getTabCount() { return mTab.getCount(); } /** * 增加缩进 */ public TabStringBuilder incTab() { mTab.inc(); return this; } /** * 减少缩进 */ public TabStringBuilder decTab() { mTab.dec(); return this; } public TabStringBuilder append(char c) { if (c == '\n' && mTab.notEmpty()) { mBuilder.append(c).append(mTab.get()); } else { mBuilder.append(c); } return this; } public TabStringBuilder append(CharSequence csq) { mBuilder.append(replaceTab(csq)); return this; } public TabStringBuilder append(Object o) { mBuilder.append(replaceTab(String.valueOf(o))); return this; } public TabStringBuilder newLine() { return append('\n'); } private CharSequence replaceTab(CharSequence csq) { if (csq != null && mTab.notEmpty()) { return csq.toString().replace("\n", "\n" + mTab.get()); } else { return csq; } } @Override public String toString() {