javax.net.ssl.SSLHandshakeException sun.security.validator.ValidatorException PK

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

请求https出现错误, 要使用加密的请求

class工具:

class SSLClient extends DefaultHttpClient {
    public SSLClient() throws Exception{
        super();
        SSLContext ctx = SSLContext.getInstance("TLS");
        X509TrustManager tm = new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }
            @Override
            public void checkServerTrusted(X509Certificate[] chain,
                                           String authType) throws CertificateException {
            }
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        };
        ctx.init(null, new TrustManager[]{tm}, null);
        SSLSocketFactory ssf = new SSLSocketFactory(ctx);
        ssf.setHostnameVerifier(SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);
        ClientConnectionManager ccm = this.getConnectionManager();
        SchemeRegistry sr = ccm.getSchemeRegistry();
        sr.register(new Scheme("https", ssf,443));
    }
}

使用:

public static String sendPost(String url,String paramter){
    Map<String,String> map =new HashMap<>();
    String[] args=paramter.split("&");

    for(String str: args){
        String[] arg=str.split("=");
        map.put(arg[0],arg[1]);
    }
    String charset="utf-8";
    HttpClient httpClient = null;
    HttpPost httpPost = null;
    String result = null;
    try{
        httpClient = new SSLClient();
        httpPost = new HttpPost(url);
        //设置参数
        List<NameValuePair> list = new ArrayList<NameValuePair>();
        Iterator iterator = map.entrySet().iterator();
        while(iterator.hasNext()){
            Map.Entry<String,String> elem = (Map.Entry<String, String>) iterator.next();
            list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));
        }
        if(list.size() > 0){
            UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);
            httpPost.setEntity(entity);
        }
        HttpResponse response = httpClient.execute(httpPost);
        if(response != null){
            HttpEntity resEntity = response.getEntity();
            if(resEntity != null){
                result = EntityUtils.toString(resEntity,charset);
            }
        }
    }catch(Exception ex){
        ex.printStackTrace();
    }
    return result;
}