wast Homepage, Documentation and Downloads – High Performance Java Library – News Fast Delivery

wast is a lightweight and high-performance java language development framework and toolkit that integrates one of the fastest json libraries and the fastest yaml parsing library, with lightweight code and no dependencies.

Function

  1. The built-in json module far surpasses the former fastjson and jackson in performance evaluation, and can occupy a clear lead even in the performance evaluation of the latest version of fastjson2;
  2. The built-in yaml parsing library performance is5-20 times of snakeyaml;
  3. The parsing performance of the built-in expression engine is about 0.5 times higher than the existing spel;

How to use JSON

// 序列化
Map map = new HashMap();
map.put("msg", "hello, light json !");
String result = JSON.toJsonString(map);

// 序列化到文件
Map map = new HashMap();
map.put("msg", "hello, light json !");
JSON.writeJsonTo(map, new File("/tmp/test.json"));

// 格式化输出
Map map = new HashMap();
map.put("name", "zhangsan");
map.put("msg", "hello, light json !");
JSON.toJsonString(map, WriteOption.FormatOut);

// 反序列化map
String json = "{\"msg\":\"hello, light json !\",\"name\":\"zhangsan\"}";
Map map = (Map) JSON.parse(json);
System.out.println(map);

// 反序列化到指定类型
String json = "{\"msg\":\"hello, light json !\",\"name\":\"zhangsan\"}";
Map map = JSON.parseObject(json, Map.class);
System.out.println(map);


//  IO流读取解析
Map result = null;
    
// 1 读取网络资源 GET
result = JSON.read(new URL("https://developer.aliyun.com/artifact/aliyunMaven/searchArtifactByGav?groupId=spring&artifactId=&version=&repoId=all&_input_charset=utf-8"), Map.class);
    
// 2 读取输入流
InputStream inputStream = InputStreamTest.class.getResourceAsStream("/sample.json");
result = JSON.read(inputStream, Map.class);
    
// 3 读取文件
result = JSON.read(new File("/tmp/smaple.json"), Map.class);

How to use YAML

    // yaml字符串
    String yamlStr = StringUtils.fromResource("/yaml/t2.yaml");
    
    // 读取文档
    YamlDocument yamlDoc = YamlDocument.parse(yamlStr);
    
    // 转换为properties
    Properties properties = yamlDoc.toProperties();
    System.out.println(properties);
    
    // 转换为map
    yamlDoc.toMap();
    
    // 转化为指定bean
    YamlTest bean = yamlDoc.toEntity(YamlTest.class);
    
    // 获取根节点
    YamlNode yamlRoot = yamlDoc.getRoot();
    
    // 查找node
    YamlNode nameNode = yamlRoot.get("/metadata/name");
    
    // 获取/metadata/name
    String metadataName = yamlRoot.getPathValue("/metadata/name", String.class);
    // 或者 nameNode.getValue();
    System.out.println(" metadataName " + metadataName);
    
    // 修改
    yamlRoot.setPathValue("/metadata/name", "this is new Value ");
    
    String newMetadataName = (String) nameNode.getValue();
    System.out.println(newMetadataName.equals("this is new Value "));
    
    // 反向序列化生成yaml字符串
    System.out.println(yamlDoc.toYamlString());
    
    // 输出到文件
    yamlDoc.writeTo(new File("/tmp/test.yaml"));

Expression engine

// 直接运行
Expression.eval("1+1");  // 输出2
Expression.eval("1+1+'a'");  // 输出2a

Map map = new HashMap();
map.put("a", 1);
map.put("b", 2);
map.put("c", 3);
Expression.eval("a+b+c",map);  // 输出6

// 解析运行
Map map = new HashMap();
map.put("a", 1);
map.put("b", 2);
map.put("c", 3);
Expression varExpr = Expression.parse("a + b + c");  // 只需要解析一次
varExpr.evaluate(map);     // 输出6

map.put("c", 30);
varExpr.evaluate(map);     // 输出33

// 函数使用
Map context = new HashMap();
context.put("tip", "1 ");
context.put("name", "zhangsan, %s");
context.put("msg", "hello");
context.put("type", 1);
context.put("a", 1);
context.put("b", 12);
context.put("c", 111);
context.put("B6_AvgCpuUsed", 1.0);
context.put("B5_AvgCpuUsed", 2.0);
context.put("B4_AvgCpuUsed", 3.0);
context.put("vars", new String[] {"hello"});

EvaluateEnvironment evaluateEnvironment = EvaluateEnvironment.create(context);
evaluateEnvironment.registerStaticMethods(Math.class, String.class);
evaluateEnvironment.registerFunction("min", new ExprFunction<Object, Number>() {
    @Override
    public Number call(Object... params) {
        Arrays.sort(params);
        return (Number) params[params.length - 1];
    }
});


System.out.println( Expression.eval("@min(@sum(a,b,c), 50, 125, 2, -11)", evaluateEnvironment));
System.out.println( Expression.eval("@max(@sum(a,b,c), 50, 125, 55, 152)", evaluateEnvironment));


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